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Sir Alexander Fleming FRS FRSE FRCS[2] (6 August 1881 – 11 March 1955) was a Scottish physician and microbiologist, best known for discovering the world's first broadly effective antibiotic substance, which he named penicillin. His discovery in 1928 of what was later named benzylpenicillin (or penicillin G) from the mould Penicillium rubens has been described as the "single greatest victory ever achieved over disease".[3][4] For this discovery, he shared the Nobel Prize in Physiology or Medicine in 1945 with Howard Florey and Ernst Chain.[5][6][7]

Key Information

He also discovered the enzyme lysozyme from his nasal discharge in 1922, and along with it a bacterium he named Micrococcus lysodeikticus, later renamed Micrococcus luteus.

Fleming was knighted for his scientific achievements in 1944.[8] In 1999, he was named in Time magazine's list of the 100 Most Important People of the 20th century. In 2002, he was chosen in the BBC's television poll for determining the 100 Greatest Britons, and in 2009, he was also voted third "greatest Scot" in an opinion poll conducted by STV, behind only Robert Burns and William Wallace.

Early life and education

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Born on 6 August 1881 at Lochfield farm near Darvel, in Ayrshire, Scotland, Alexander Fleming was the third of four children of farmer Hugh Fleming and Grace Stirling Morton, the daughter of a neighbouring farmer. Hugh Fleming had four surviving children from his first marriage. He was 59 at the time of his second marriage to Grace, and died when Alexander was seven.[9]

Fleming went to Loudoun Moor School and Darvel School, and earned a two-year scholarship to Kilmarnock Academy before moving to London, where he attended the Royal Polytechnic Institution.[10] After working in a shipping office for four years, the twenty-year-old Alexander Fleming inherited some money from an uncle, John Fleming. His elder brother, Tom, was already a physician and suggested to him that he should follow the same career, and so in 1903, the younger Alexander enrolled at St Mary's Hospital Medical School in Paddington (now part of Imperial College London); he qualified with an MBBS degree from the school with distinction in 1906.[9]

Fleming, who was a private in the London Scottish Regiment of the Volunteer Force from 1900[5] to 1914,[11] had been a member of the rifle club at the medical school. The captain of the club, wishing to retain Fleming in the team, suggested that he join the research department at St Mary's, where he became assistant bacteriologist to Sir Almroth Wright, a pioneer in vaccine therapy and immunology. In 1908, he gained a BSc degree with gold medal in bacteriology, and became a lecturer at St Mary's until 1914.

Commissioned lieutenant in 1914 and promoted captain in 1917,[11] Fleming served throughout World War I in the Royal Army Medical Corps, and was Mentioned in Dispatches. He and many of his colleagues worked in battlefield hospitals at the Western Front in France.

In 1918 he returned to St Mary's Hospital, where he was elected Professor of Bacteriology of the University of London in 1928. In 1951 he was elected the Rector of the University of Edinburgh for a term of three years.[9]

Scientific contributions

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Antiseptics

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During World War I, Fleming with Leonard Colebrook and Sir Almroth Wright joined the war efforts and practically moved the entire Inoculation Department of St Mary's to the British military hospital at Boulogne-sur-Mer. Serving as a temporary lieutenant of the Royal Army Medical Corps, he witnessed the death of many soldiers from sepsis resulting from infected wounds. Antiseptics, which were used at the time to treat infected wounds, he observed, often worsened the injuries.[12] In an article published in the medical journal The Lancet in 1917, he described an ingenious experiment, which he was able to conduct as a result of his own glassblowing skills, in which he explained why antiseptics were killing more soldiers than infection itself during the war. Antiseptics worked well on the surface, but deep wounds tended to shelter anaerobic bacteria from the antiseptic agent, and antiseptics seemed to remove beneficial agents produced that protected the patients in these cases at least as well as they removed bacteria, and did nothing to remove the bacteria that were out of reach.[13] Wright strongly supported Fleming's findings, but despite this, most army physicians over the course of the war continued to use antiseptics even in cases where this worsened the condition of the patients.[9]

Discovery of lysozyme

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At St Mary's Hospital, Fleming continued his investigations into bacteria culture and antibacterial substances. As his research scholar at the time V. D. Allison recalled, Fleming was not a tidy researcher and usually expected unusual bacterial growths in his culture plates. Fleming had teased Allison of his "excessive tidiness in the laboratory", and Allison rightly attributed such untidiness as the success of Fleming's experiments, and said, "[If] he had been as tidy as he thought I was, he would not have made his two great discoveries."[14]

In late 1921, while Fleming was maintaining agar plates for bacteria, he found that one of the plates was contaminated with bacteria from the air. When he added nasal mucus, he found that the mucus inhibited the bacterial growth.[15] Surrounding the mucus area was a clear transparent circle (1 cm from the mucus), indicating the killing zone of bacteria, followed by a glassy and translucent ring beyond which was an opaque area indicating normal bacterial growth. In the next test, he used bacteria maintained in saline that formed a yellow suspension. Within two minutes of adding fresh mucus, the yellow saline turned completely clear. He extended his tests using tears, which were contributed by his co-workers. As Allison reminisced, saying, "For the next five or six weeks, our tears were the source of supply for this extraordinary phenomenon. Many were the lemons we used (after the failure of onions) to produce a flow of tears... The demand by us for tears was so great, that laboratory attendants were pressed into service, receiving threepence for each contribution."[14]

His further tests with sputum, cartilage, blood, semen, ovarian cyst fluid, pus, and egg white showed that the bactericidal agent was present in all of these.[16] He reported his discovery before the Medical Research Club in December and before the Royal Society the next year but failed to stir any interest, as Allison recollected:

I was present at this [Medical Research Club] meeting as Fleming's guest. His paper describing his discovery was received with no questions asked and no discussion, which was most unusual and an indication that it was considered to be of no importance. The following year he read a paper on the subject before the Royal Society, Burlington House, Piccadilly and he and I gave a demonstration of our work. Again with one exception little comment or attention was paid to it.[14]

Reporting in the 1 May 1922 issue of the Proceedings of the Royal Society B: Biological Sciences under the title "On a remarkable bacteriolytic element found in tissues and secretions", Fleming wrote:

In this communication I wish to draw attention to a substance present in the tissues and secretions of the body, which is capable of rapidly dissolving certain bacteria. As this substance has properties akin to those of ferments I have called it a "Lysozyme", and shall refer to it by this name throughout the communication. The lysozyme was first noticed during some investigations made on a patient suffering from acute coryza.[15]

This was the first recorded discovery of lysozyme. With Allison, he published further studies on lysozyme in October issue of the British Journal of Experimental Pathology the same year.[17] Although he was able to obtain larger amounts of lysozyme from egg whites, the enzyme was only effective against small counts of harmless bacteria, and therefore had little therapeutic potential. This indicates one of the major differences between pathogenic and harmless bacteria.[12] Described in the original publication, "a patient suffering from acute coryza"[15] was later identified as Fleming himself. His research notebook dated 21 November 1921 showed a sketch of the culture plate with a small note: "Staphyloid coccus from A.F.'s nose."[16] He also identified the bacterium present in the nasal mucus as Micrococcus Lysodeikticus, giving the species name (meaning "lysis indicator" for its susceptibility to lysozymal activity).[18] The species was reassigned as Micrococcus luteus in 1972.[19] The "Fleming strain" (NCTC2665) of this bacterium has become a model in different biological studies.[20][21] The importance of lysozyme was not recognised, and Fleming was well aware of this, in his presidential address at the Royal Society of Medicine meeting on 18 October 1932, he said:

I choose lysozyme as the subject for this address for two reasons, firstly because I have a fatherly interest in the name, and, secondly, because its importance in connection with natural immunity does not seem to be generally appreciated.[22]

In his Nobel lecture on 11 December 1945, he briefly mentioned lysozyme, saying, "Penicillin was not the first antibiotic I happened to discover."[23] It was only towards the end of the 20th century that the true importance of Fleming's discovery in immunology was realised as lysozyme became the first antimicrobial protein discovered that constitute part of our innate immunity.[24][25]

Discovery of penicillin

[edit]
Main article: History of penicillin
An advertisement advertising penicillin's "miracle cure"

One sometimes finds what one is not looking for. When I woke up just after dawn on September 28, 1928, I certainly didn't plan to revolutionize all medicine by discovering the world's first antibiotic, or bacteria killer. But I suppose that was exactly what I did.

— Alexander Fleming[26]

Experiment

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By 1927, Fleming had been investigating the properties of staphylococci. He was already well known from his earlier work, and had developed a reputation as a brilliant researcher. In 1928, he studied the variation of Staphylococcus aureus grown under natural condition, after the work of Joseph Warwick Bigger, who discovered that the bacterium could grow into a variety of types (strains).[27] On 3 September 1928, Fleming returned to his laboratory having spent a holiday with his family at Suffolk. Before leaving for his holiday, he inoculated staphylococci on culture plates and left them on a bench in a corner of his laboratory.[16] On his return, Fleming noticed that one culture was contaminated with a fungus, and that the colonies of staphylococci immediately surrounding the fungus had been destroyed, whereas other staphylococci colonies farther away were normal, famously remarking "That's funny".[28] Fleming showed the contaminated culture to his former assistant Merlin Pryce, who reminded him, "That's how you discovered lysozyme."[29][page needed] He identified the mould as being from the genus Penicillium. He suspected it to be P. chrysogenum, but a colleague Charles J. La Touche identified it as P. rubrum. (It was later corrected as P. notatum and then officially accepted as P. chrysogenum; in 2011, it was resolved as P. rubens.)[30][31]

Commemorative plaque marking Fleming's discovery of penicillin at St Mary's Hospital, London

The laboratory in which Fleming discovered and tested penicillin is preserved as the Alexander Fleming Laboratory Museum in St. Mary's Hospital, Paddington. The source of the fungal contaminant was established in 1966 as coming from La Touche's room, which was directly below Fleming's.[32][33]

Fleming grew the mould in a pure culture and found that the culture broth contained an antibacterial substance. He investigated its anti-bacterial effect on many organisms, and noticed that it affected bacteria such as staphylococci and many other Gram-positive pathogens that cause scarlet fever, pneumonia, meningitis and diphtheria, but not typhoid fever or paratyphoid fever, which are caused by Gram-negative bacteria, for which he was seeking a cure at the time. It also affected Neisseria gonorrhoeae, which causes gonorrhoea, although this bacterium is Gram-negative. After some months of calling it "mould juice" or "the inhibitor", he gave the name penicillin on 7 March 1929 for the antibacterial substance present in the mould.[34]

Reception and publication

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Fleming presented his discovery on 13 February 1929 before the Medical Research Club. His talk on "A medium for the isolation of Pfeiffer's bacillus" did not receive any particular attention or comment. Henry Dale, the then Director of National Institute for Medical Research and chair of the meeting, much later reminisced that he did not even sense any striking point of importance in Fleming's speech.[16] Fleming published his discovery in 1929 in the British Journal of Experimental Pathology,[35] but little attention was paid to the article. His problem was the difficulty of producing penicillin in large amounts, and moreover, isolation of the main compound. Even with the help of Harold Raistrick and his team of biochemists at the London School of Hygiene & Tropical Medicine, chemical purification was futile. "As a result, penicillin languished largely forgotten in the 1930s", as Milton Wainwright described.[36]

As late as in 1936, there was no appreciation for penicillin. When Fleming talked of its medical importance at the Second International Congress of Microbiology held in London,[37][38] no one believed him. As Allison, his companion in both the Medical Research Club and international congress meeting, remarked the two occasions:

[Fleming at the Medical Research Club meeting] suggested the possible value of penicillin for the treatment of infection in man. Again there was a total lack of interest and no discussion. Fleming was keenly disappointed, but worse was to follow. He read a paper on his work on penicillin at a meeting of the International Congress of Microbiology, attended by the foremost bacteriologists from all over the world. There was no support for his views on its possible future value for the prevention and treatment of human infections and discussion was minimal. Fleming bore these disappointments stoically, but they did not alter his views or deter him from continuing his investigation of penicillin.[14]

In 1941, the British Medical Journal reported that "[Penicillin] does not appear to have been considered as possibly useful from any other point of view."[39][40][32]

Purification and stabilisation

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3D-model of benzylpenicillin

In Oxford, Ernst Chain and Edward Abraham were studying the molecular structure of the antibiotic. Abraham was the first to propose the correct structure of penicillin.[41][42] Shortly after the team published its first results in 1940, Fleming telephoned Howard Florey, Chain's head of department, to say that he would be visiting within the next few days. When Chain heard that Fleming was coming, he remarked "Good God! I thought he was dead."[43]

Norman Heatley suggested transferring the active ingredient of penicillin back into water by changing its acidity. This produced enough of the drug to begin testing on animals. There were many more people involved in the Oxford team, and at one point the entire Sir William Dunn School of Pathology was involved in its production. After the team had developed a method of purifying penicillin to an effective first stable form in 1940, several clinical trials ensued, and their amazing success inspired the team to develop methods for mass production and mass distribution in 1945.[44][45]

Fleming was modest about his part in the development of penicillin, describing his fame as the "Fleming Myth" and he praised Florey and Chain for transforming the laboratory curiosity into a practical drug. Fleming was the first to discover the properties of the active substance, giving him the privilege of naming it: penicillin. He also kept, grew, and distributed the original mould for twelve years, and continued until 1940 to try to get help from any chemist who had enough skill to make penicillin. Sir Henry Harris summed up the process in 1998 as: "Without Fleming, no Chain; without Chain, no Florey; without Florey, no Heatley; without Heatley, no penicillin."[46] The discovery of penicillin and its subsequent development as a prescription drug mark the start of modern antibiotics.[47]

Medical use and mass production

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In his first clinical trial, Fleming treated his research scholar Stuart Craddock who had developed severe infection of the nasal antrum (sinusitis). The treatment started on 9 January 1929 but without any effect. It probably was due to the fact that the infection was with influenza bacillus (Haemophilus influenzae), the bacterium which he had found unsusceptible to penicillin.[32] Fleming gave some of his original penicillin samples to his colleague-surgeon Arthur Dickson Wright for clinical test in 1928.[48][49] Although Wright reportedly said that it "seemed to work satisfactorily",[50] there are no records of its specific use. Cecil George Paine, a pathologist at the Royal Infirmary in Sheffield and former student of Fleming, was the first to use penicillin successfully for medical treatment.[36] He cured eye infections (conjunctivitis) of one adult and three infants (neonatal conjunctivitis) on 25 November 1930.[51]

Fleming in his laboratory in 1943

Fleming also successfully treated severe conjunctivitis in 1932.[3][52][53] Keith Bernard Rogers, who had joined St Mary's as medical student in 1929,[54] was captain of the London University rifle team and was about to participate in an inter-hospital rifle shooting competition when he developed conjunctivitis.[55][56][57] Fleming applied his penicillin and cured Rogers before the competition.[3][52][58] It is said that the "penicillin worked and the match was won." However, the report that "Keith was probably the first patient to be treated clinically with penicillin ointment"[56] is no longer true as Paine's medical records showed up.[34]

There is a popular assertion both in popular and scientific literature that Fleming largely abandoned penicillin work in the early 1930s.[59][60][61][62] In his review of André Maurois's The Life of Sir Alexander Fleming, Discoverer of Penicillin, William L. Kissick went so far as to say that "Fleming had abandoned penicillin in 1932... Although the recipient of many honors and the author of much scientific work, Sir Alexander Fleming does not appear to be an ideal subject for a biography."[63] This is false, as Fleming continued to pursue penicillin research.[49][64] As late as in 1939, Fleming's notebook shows attempts to make better penicillin production using different media.[34] In 1941, he published a method for assessment of penicillin effectiveness.[65] As to the chemical isolation and purification, Howard Florey and Ernst Chain at the Radcliffe Infirmary in Oxford took up the research to mass-produce it, which they achieved with support from World War II military projects under the British and US governments.[66]

By mid-1942, the Oxford team produced the pure penicillin compound as yellow powder.[67] In August 1942, Harry Lambert (an associate of Fleming's brother Robert) was admitted to St Mary's Hospital due to a life-threatening infection of the nervous system (streptococcal meningitis).[4] Fleming treated him with sulphonamides, but Lambert's condition deteriorated. He tested the antibiotic susceptibility and found that his penicillin could kill the bacteria. He requested Florey for the isolated sample. Florey sent the incompletely purified sample, which Fleming immediately administered into Lambert's spinal canal. Lambert showed signs of improvement the very next day,[14] and completely recovered within a week.[3][68] Fleming published the clinical case in The Lancet in 1943.[69]

Upon this medical breakthrough, Allison informed the British Ministry of Health of the importance of penicillin and the need for mass production. The War Cabinet was convinced of the usefulness upon which Sir Cecil Weir, Director General of Equipment, called for a meeting on the mode of action on 28 September 1942.[70][71] The Penicillin Committee was created on 5 April 1943. The committee consisted of Weir as chairman, Fleming, Florey, Sir Percival Hartley, Allison and representatives from pharmaceutical companies as members. The main goals were to produce penicillin rapidly in large quantities with collaboration of American companies, and to supply the drug exclusively for Allied armed forces.[14] By D-Day in 1944, enough penicillin had been produced to treat all the wounded of the Allied troops.[72]

Antibiotic resistance

[edit]
Modern antibiotics are tested using a method similar to Fleming's discovery.

Fleming also discovered very early that bacteria developed antibiotic resistance whenever too little penicillin was used or when it was used for too short a period. Almroth Wright had predicted antibiotic resistance even before it was noticed during experiments. Fleming cautioned about the use of penicillin in his many speeches around the world. On 26 June 1945, he made the following cautionary statements: "the microbes are educated to resist penicillin and a host of penicillin-fast organisms is bred out ... In such cases the thoughtless person playing with penicillin is morally responsible for the death of the man who finally succumbs to infection with the penicillin-resistant organism. I hope this evil can be averted."[73] He cautioned not to use penicillin unless there was a properly diagnosed reason for it to be used, and that if it were used, never to use too little, or for too short a period, since these are the circumstances under which bacterial resistance to antibiotics develops.[74]

It had been experimentally shown in 1942 that S. aureus could develop penicillin resistance under prolonged exposure.[75] Elaborating the possibility of penicillin resistance in clinical conditions in his Nobel Lecture, Fleming said:

The time may come when penicillin can be bought by anyone in the shops. Then there is the danger that the ignorant man may easily underdose himself and by exposing his microbes to non-lethal quantities of the drug make them resistant.[23]

It was around that time that the first clinical case of penicillin resistance was reported.[76]

Personal life

[edit]

On 24 December 1915, Fleming married a trained nurse, Sarah Marion McElroy of Killala, County Mayo, Ireland. Their only child, Robert Fleming (1924–2015), became a general medical practitioner. After his first wife's death in 1949, Fleming married Amalia Koutsouri-Vourekas, a Greek colleague at St. Mary's, on 9 April 1953; she died in 1986.[77]

Fleming came from a Presbyterian background, while his first wife Sarah was a (lapsed) Roman Catholic. It is said that he was not particularly religious, and their son Robert was later received into the Anglican church, while still reportedly inheriting his two parents' fairly irreligious disposition.[78]

When Fleming learned of Robert D. Coghill and Andrew J. Moyer patenting the method of penicillin production in the United States in 1944,[79] he was furious, and commented:

I found penicillin and have given it free for the benefit of humanity. Why should it become a profit-making monopoly of manufacturers in another country?[14]

From 1921 until his death in 1955, Fleming owned a country home named "The Dhoon" in Barton Mills, Suffolk.[4][80]

Death

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Grave of Sir Alexander Fleming in the crypt of St Paul's Cathedral, London

On 11 March 1955, Fleming died at his home in London of a heart attack. His ashes are buried in St Paul's Cathedral.[1]

Awards and legacy

[edit]
Display of Fleming's awards, including his Nobel Prize. Also shows a sample of penicillin and an example of an early apparatus for preparing it.
Sir Alexander Fleming (centre) receiving the Nobel prize from King Gustaf V of Sweden (right) in 1945
Faroe Islands postage stamp commemorating Fleming
Barcelona to Sir Alexander Fleming (1956), by Catalan sculptor Josep Manuel Benedicto. Barcelona: jardins del Doctor Fleming.

Fleming's discovery of penicillin changed the world of modern medicine by introducing the age of useful antibiotics; penicillin has saved, and is still saving, millions of people around the world.[81]

The laboratory at St Mary's Hospital where Fleming discovered penicillin is home to the Fleming Museum, a popular London attraction. His alma mater, St Mary's Hospital Medical School, merged with Imperial College London in 1988. The Sir Alexander Fleming Building on the South Kensington campus was opened in 1998, where his son Robert and his great-granddaughter Claire were presented to the Queen; it is now one of the main preclinical teaching sites of the Imperial College School of Medicine.

His other alma mater, the Royal Polytechnic Institution (now the University of Westminster) has named one of its student halls of residence Alexander Fleming House, which is near to Old Street.

Myths

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The Fleming myth

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By 1942, penicillin, produced as pure compound, was still in short supply and not available for clinical use. When Fleming used the first few samples prepared by the Oxford team to treat Harry Lambert who had streptococcal meningitis,[3] the successful treatment was major news, particularly popularised in The Times. Wright was surprised to discover that Fleming and the Oxford team had not been mentioned, though Oxford was attributed as the source of the drug. Wright wrote to the editor of The Times, which eagerly interviewed Fleming, but Florey prohibited the Oxford team from seeking media coverage. As a consequence, only Fleming was widely publicised in the media,[95] which led to the misconception that he was entirely responsible for the discovery and development of the drug.[96] Fleming himself referred to this incident as "the Fleming myth."[97][98]

The Churchills

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The popular story[99] of Winston Churchill's father paying for Fleming's education after Fleming's father saved young Winston from death is false.[96] According to the biography, Penicillin Man: Alexander Fleming and the Antibiotic Revolution by Kevin Brown, Alexander Fleming, in a letter[100] to his friend and colleague Andre Gratia,[101] described this as "A wondrous fable." Nor did he save Winston Churchill himself during World War II. Churchill was saved by Lord Moran, using sulphonamides, since he had no experience with penicillin, when Churchill fell ill in Carthage in Tunisia in 1943.[102] The Daily Telegraph and The Morning Post on 21 December 1943 wrote that he had been saved by penicillin. He was saved by the new sulphonamide drug sulphapyridine, known at the time under the research code M&B 693, discovered and produced by May & Baker Ltd, Dagenham, Essex – a subsidiary of the French group Rhône-Poulenc. In a subsequent radio broadcast, Churchill referred to the new drug as "This admirable M&B".[102][103]

See also

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References

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Further reading

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[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Alexander Fleming

View on Grokipedia
from Grokipedia
Sir Alexander Fleming (6 August 1881 – 11 March 1955) was a Scottish physician and renowned for discovering penicillin in 1928, the world's first widely effective , which revolutionized by enabling the treatment of previously lethal bacterial infections. Born at Lochfield farm near in , , Fleming grew up in a rural family and pursued education at local schools before studying medicine at the , where he qualified with distinction in 1906 and earned his M.B., B.S. degree with a in 1908. He joined St. Mary’s Hospital Medical School in as a researcher under Sir Almroth Wright, focusing on and , and served as a captain in the Royal Army Medical Corps during , where he developed early antiseptics to combat wound infections. Fleming's breakthrough came in September 1928 when, while studying staphylococci at St. Mary’s, he observed that a mould contaminant (Penicillium notatum) on a culture plate had produced a substance that inhibited bacterial growth around it; he isolated this compound, named it penicillin, and published his findings in 1929, though initial efforts to purify and produce it in quantity were limited. Earlier in his career, he had also discovered the antibacterial enzyme in 1921, which helped lay the groundwork for his later work on antimicrobial agents. For his penicillin discovery and its demonstration of curative effects against infectious diseases, Fleming shared the 1945 in Physiology or Medicine with Ernst Boris Chain and , who advanced its purification and clinical application; the award recognized how penicillin saved countless lives during and beyond by combating infections like and . He was knighted in 1944, elected a in 1943, and appointed professor of bacteriology at the in 1928, continuing research until his death from a heart attack in at age 73; he was buried in St. Paul’s Cathedral. Fleming's legacy endures in modern therapy, though he presciently warned of resistance risks from misuse in his 1945 Nobel lecture.

Early Life and Education

Childhood and Family Background

Alexander Fleming was born on August 6, 1881, at Lochfield Farm near in , , to Hugh Fleming, a , and Grace Morton. He was the third of four surviving children from his parents' marriage, though the family included eight children in total, with four half-siblings from his father's previous marriage. The Flemings led a modest life on their 800-acre farm, isolated a mile from the nearest house, where the family relied on farming for sustenance amid . Fleming's father died when he was seven years old in 1888, leaving his mother to raise the large family and manage the farm with the help of the older sons. This early loss instilled a strong sense of and responsibility in young Fleming, as the household faced financial hardships without paternal support. Growing up on the farm exposed him to the rhythms of nature, where he spent time exploring nearby streams, valleys, and moors, unconsciously absorbing lessons from the natural world that later influenced his scientific curiosity. He attended the local Darvel School and Loudoun Moor School, followed by a two-year scholarship to in 1894, developing an early interest in observation and independence shaped by rural life. Fleming's decision to pursue was significantly influenced by his older brother Tom, a successful ophthalmologist who had established a practice in . At around age 13 or 14, Fleming moved to in 1895 with three brothers and a sister to join Tom, marking the transition from his rural upbringing to formal urban .

Medical Training and Early Influences

At the age of 13, in 1895, Alexander Fleming moved from his family farm in , , to to live with his older brother Tom, a successful ophthalmic who provided financial and emotional support for his . This relocation marked a pivotal shift, allowing Fleming to attend classes at the Polytechnic while working as a shipping clerk to contribute to household expenses. His time at the Polytechnic built a strong foundation in science and mathematics, preparing him for advanced studies. In 1901, Fleming secured an entrance scholarship to St. Mary's Hospital Medical School in , , where he pursued a rigorous curriculum in . He excelled academically, qualifying with distinction in 1906 and was awarded the Bachelor of Medicine and Bachelor of Surgery (M.B., B.S.) degree from the in 1908 with a . This achievement reflected his aptitude for clinical and scientific inquiry, honed through hands-on training in hospital wards and laboratories. Following qualification, Fleming was appointed as an assistant in the Inoculation Department at St. Mary's Hospital under Sir Almroth Wright, a leading figure in vaccine therapy and whose work on typhoid vaccines had revolutionized preventive medicine. Wright's mentorship profoundly influenced Fleming, immersing him in bacteriological techniques and the study of immune responses, which sparked his lifelong interest in antibacterial agents. In this role, Fleming conducted early hospital duties as a surgeon in the department, applying methods to treat infectious diseases and gaining practical experience in clinical microbiology.

Research Career

Work on Antiseptics

During , Alexander Fleming served as a captain in the Royal Army Medical Corps, working under Sir Almroth Wright at a casualty clearing station near , . There, he witnessed the high mortality rates from infected wounds among soldiers, despite routine application of chemical antiseptics such as carbolic acid and , which often exacerbated infections by damaging the body's protective mechanisms. Fleming's observations highlighted how these agents failed to effectively combat deep-seated bacterial infections in battlefield injuries. In a seminal 1919 paper published in the British Journal of Surgery, Fleming systematically critiqued the limitations of chemical s in treating septic wounds. He demonstrated that these substances were rapidly inactivated by body fluids like and serum, preventing them from penetrating irregular wound surfaces to reach and kill embedded . Furthermore, at concentrations sufficient to inhibit surface , antiseptics proved more toxic to leukocytes—key cells in the —than to the pathogens themselves, thereby hindering the natural healing process. This work underscored the inadequacy of prevailing antiseptic protocols for deep infections. Influenced by Wright's emphasis on phagocytosis—the process by which white blood cells engulf and destroy bacteria—Fleming argued that reliance on chemical antiseptics undermined the body's innate defenses more than it aided recovery. He advocated prioritizing surgical debridement and the promotion of physiological responses, such as leukocytic activity, over indiscriminate use of toxic agents. Returning to St. Mary's Hospital in London after the war, Fleming continued his bacteriological research, focusing on the principle of selective toxicity in potential antimicrobial agents. In a 1924 study, he compared various antiseptics and found that substances like phenol killed leukocytes at dilutions that spared bacteria, reinforcing his call for agents that targeted pathogens without harming host tissues. This concept became foundational to his later investigations into safer antibacterial therapies.

Discovery of Lysozyme

In November 1921, Alexander Fleming, while suffering from a , accidentally contaminated a bacterial culture plate with droplets of his nasal . Upon observation, he noticed that the caused —dissolution—of the surrounding , particularly of Gram-positive cocci, while allowing other to proliferate unaffected. This serendipitous incident prompted further investigation into the antibacterial properties of nasal secretions. Fleming isolated the active agent from the and identified it as an present in various and secretions, including , , and egg whites. In a seminal 1922 paper published in the Proceedings of the Royal Society, he described the substance's bacteriolytic effects and named it "lysozyme," combining "lyso-" from the Greek for dissolution with "-zyme" for its -like ferment properties. The was particularly abundant in egg whites, which Fleming used to obtain larger quantities for study. Extensive testing revealed lysozyme's selective antibacterial activity: it rapidly lysed certain , such as the newly isolated Micrococcus lysodeikticus (later reclassified as a strain of ), by breaking down their cell walls, but showed no effect on due to their outer membrane barrier. This discovery marked the first identification of a naturally occurring antibacterial by Fleming, laying groundwork for understanding innate immune defenses, though its weak potency against pathogens limited immediate clinical impact. Early explorations included its potential use in for treating minor infections, leveraging its presence in tears.

Initial Bacterial Studies

Upon returning from military service in 1919, Fleming resumed his work at St. Mary's Hospital Medical School in as an assistant in the Inoculation Department, where he focused on bacteriological research under the influence of Sir Almroth Wright's school of vaccine therapy. In 1920, he was appointed lecturer in , a position that allowed him to deepen his investigations into bacterial pathogens, and by 1928, he had been elevated to professor of at St. Mary's Hospital Medical School. These roles solidified his commitment to understanding bacterial infections through systematic laboratory analysis, building on Wright's emphasis on opsonins and the body's immune responses to enhance efficacy against diseases caused by pathogens like staphylococci and streptococci. Fleming's research in the centered on key bacterial species, including staphylococci, streptococci, and the influenza bacillus (), which he examined for their roles in respiratory and wound infections. He developed innovative techniques for culturing these organisms on plates and for them, such as the use of for enhanced visibility in microscopic preparations, which improved the identification of bacterial morphology and virulence factors like capsule formation and production. These methods were essential for assessing bacterial susceptibility and host defenses, often involving the observation of growth patterns and clear zones of inhibition around potential inhibitory agents on culture media—a routine practice that underscored the importance of precise environmental controls in . Throughout this period, Fleming contributed to the evaluation of efficacy by studying how bacterial factors influenced immune responses, extending Wright's work on therapeutic for conditions like and . His experiments demonstrated that vaccines could modulate opsonization—the process by which antibodies and target bacteria—thereby reducing infection severity in controlled settings, though challenges in limited widespread adoption. These foundational studies not only refined protocols for bacterial isolation and but also laid the groundwork for recognizing natural mechanisms in clinical contexts.

Discovery and Development of Penicillin

The Accidental Observation

In September 1928, Alexander Fleming returned from a holiday in to his at St. Mary's Hospital in , where he began sorting through petri dishes containing cultures of bacteria that he had left on his bench before departing. Among these, one dish caught his attention due to contamination by a greenish mold, later identified as Penicillium notatum, which had produced a clear zone of inhibition around its growth, where the surrounding staphylococcal colonies appeared lysed and translucent. This mold had likely originated from a nearby in the same building, where similar strains were under study, allowing it to accidentally contaminate the open culture plate during Fleming's absence. Fleming isolated the mold and subcultured it, observing that its diffusible substance inhibited the growth of nearby bacterial colonies while sparing those farther away, suggesting a selective antibacterial effect rather than a general toxicant. He prepared broth cultures of the mold and tested the filtered liquid on various pathogens in vitro, finding that it rapidly killed staphylococci, streptococci, Neisseria gonorrhoeae, Corynebacterium diphtheriae, and other gram-positive bacteria, though it showed little activity against gram-negative organisms like Escherichia coli. In his 1929 publication detailing these findings, Fleming named the active substance "penicillin" after its fungal source and highlighted its promise as a selective , capable of destroying harmful without the broad toxicity of chemical disinfectants like phenol, potentially aiding in isolating fastidious pathogens such as . He emphasized that this lytic property could revolutionize bacteriological techniques and therapeutic approaches, though further development would require overcoming challenges in stability and production.

Laboratory Experiments and Identification

Following his initial observation of the mold's antibacterial effect in 1928, Alexander Fleming conducted systematic laboratory experiments at St. Mary's Hospital Medical School in to characterize the substance he named penicillin. These studies, spanning 1929 to 1931, involved collaboration with colleagues including his assistant Daniel Merlin Pryce and others such as Mr. Ridley, Mr. Craddock, Dr. McLean, and Mr. la Touche, who assisted in culturing and testing. Fleming prepared crude filtrates from notatum cultures grown in broth and tested their properties against various using diffusion methods, where inhibition zones were measured to quantify antibacterial activity. For instance, against staphylococci, unheated filtrates produced zones up to 23 mm in diameter, while boiled samples yielded 17 mm zones, demonstrating measurable potency. Fleming's experiments revealed penicillin's selective antibacterial spectrum, primarily effective against Gram-positive bacteria such as staphylococci, streptococci, and diphtheria bacilli, but inactive against Gram-negative organisms like those in the coli-typhoid group or Haemophilus influenzae. He also assessed heat stability by heating filtrates at various temperatures: exposure to 56°C or 80°C for one hour had no effect, and brief boiling (a few minutes) hardly reduced activity, though autoclaving at 115°C for 20 minutes nearly destroyed it. Toxicity tests confirmed its safety; intravenous injection of 20 c.c. into rabbits showed no adverse effects beyond those of plain broth, and 0.5 c.c. intraperitoneally into mice (20 g) produced no symptoms, indicating non-toxicity to animals. Additionally, it proved non-irritant to human conjunctiva and infected tissues. In his seminal 1929 paper published in the British Journal of Experimental Pathology, Fleming described the extraction of penicillin using absolute alcohol after evaporation—yielding a substance insoluble in or —and highlighted its instability, which caused activity to diminish over 10-14 days at , though it remained more stable at 6.8. Despite these challenges preventing full purification, he recognized penicillin's potential for systemic use, suggesting it as "an efficient for application to, or injection into, areas infected with penicillin-sensitive microbes" due to its low toxicity and selective action. By , however, Fleming's work stalled, as the substance's instability and the absence of suitable isolation techniques at the time limited further progress.

Purification Challenges and Solutions

In the late 1930s, and at the revived interest in Fleming's penicillin, building on his preliminary observations of the substance's instability in crude form. Beginning their systematic investigation in 1938, they employed techniques such as acidification to adjust for stability and alumina to separate and concentrate the active compound from fungal extracts. By May 1940, their team, including Edward Abraham, had isolated a purified form of penicillin sufficient for initial biological testing, marking a critical advancement over Fleming's earlier impure preparations. The purified penicillin was chemically characterized as containing a beta-lactam ring fused to a five-membered thiazolidine ring, with the core structure later confirmed in 1945 as a derivative of 6-aminopenicillanic acid through by . To address ongoing stability issues, Chain developed freeze-drying methods to produce a dry powder form, while conversion to the sodium salt enhanced solubility and shelf life without significant loss of potency. These innovations overcame the compound's sensitivity to heat, light, and neutral pH environments noted in Fleming's initial work. Key challenges in purification included extremely low yields from surface culture methods, which produced only milligrams from large volumes of mold , and high risks of bacterial during extraction. These were partially mitigated through repeated fractional extractions and chromatographic purification, but yields remained insufficient for broader use until later adoption of deep-tank submerged fermentation techniques improved production efficiency. In his 1945 Nobel Prize lecture, Fleming openly acknowledged the pivotal contributions of Florey, Chain, and their collaborators in purifying and developing penicillin into a viable therapeutic agent.

Scaling Up Production for Wartime Use

With the outbreak of , the limited laboratory-scale production of penicillin in Britain proved insufficient to meet wartime medical needs, prompting collaboration with the in 1941. The British Medical Research Council approached American pharmaceutical companies and government agencies for assistance in scaling up manufacturing, as British facilities were strained by bombing and resource shortages. Researchers at the U.S. Department of Agriculture's Northern Regional Research Laboratory (NRRL) in , played a pivotal role by screening thousands of mold samples and identifying a high-yielding strain of isolated from a moldy in a local market. This strain produced up to 100 times more penicillin than Fleming's original Penicillium notatum, revolutionizing yield potential and was promptly distributed to industry partners for commercial development. To achieve industrial-scale output, adapted deep-tank fermentation techniques, drawing on their pre-war experience with production. Engineers Jasper Kane and John L. McKeen converted an old ice plant in into a facility with massive stainless-steel tanks—each holding up to 7,500 gallons of aerated nutrient broth—where the mold could grow submerged under controlled conditions of temperature, , and oxygen. This method, which replaced labor-intensive surface fermentation on trays, allowed and dramatically reduced costs, with delivering the first commercial batch in early 1942. Building briefly on prior purification techniques, the process incorporated solvent extraction and to isolate penicillin from the fermented broth, enabling viable quantities for clinical use. The British and American governments heavily funded these efforts, with the U.S. coordinating resources and allocating over $2 million in contracts by , treating penicillin as a top-priority equivalent to munitions. Production surged as a result: from mere milligrams in 1941 to 21 billion units across the in 1943 alone, equivalent to enough to treat thousands of patients monthly by year's end. This ramp-up facilitated the drug's debut in human trials, including the treatment of police officer Albert Alexander in February 1941, whose severe facial infection temporarily responded to intravenous doses despite the era's impure extracts. By 1943, scaled production enabled penicillin's deployment in combat zones, notably saving lives during the through treatment of and other wound infections among Allied troops. Alexander Fleming, recognizing the drug's transformative potential, supported its equitable wartime allocation by emphasizing in public statements and collaborations the need for broad access beyond military lines to maximize benefits.

Later Career and Recognition

Medical Applications and Global Impact

Penicillin's introduction into clinical practice marked a pivotal advancement in treating bacterial infections, particularly , , and wound infections. By the mid-1940s, it had become the standard therapy for in both British and U.S. armed forces, effectively combating the spirochete and halting disease progression. For caused by streptococci, penicillin drastically lowered mortality rates, transforming a once-fatal condition into a manageable illness. In wound infections, especially those prevalent during , the proved invaluable; the U.S. Army documented its efficacy in preventing from battlefield injuries, allowing surgeons to close wounds more confidently without fear of rampant infection. The drug's broader impact extended to and , where it dramatically reduced post-operative mortality by curbing surgical site infections. Prior to penicillin, infections complicated up to 50% of surgical procedures, often leading to or death; its use enabled safer operations, including elective surgeries, by minimizing bacterial contamination risks. In , penicillin contributed to a sharp decline in maternal mortality from puerperal , a leading in , allowing for safer deliveries and reducing infection-related complications in postpartum care. Overall, penicillin is credited with saving millions of lives during and after —including the treatment of over 100,000 Allied soldiers—and continuing to prevent countless deaths from infectious diseases in the postwar era. Alexander Fleming played a key role in popularizing penicillin through public lectures and demonstrations in the 1940s, including his 1945 Nobel Lecture, where he detailed its potential while cautioning against misuse. As Cutter Lecturer at that same year, he showcased its bactericidal effects to medical audiences, fostering widespread adoption among physicians. Following the war, the facilitated global distribution starting in the late 1940s, funding production facilities and training programs in developing countries to ensure equitable access, which further amplified penicillin's transformative effects on worldwide. Fleming remained active in research at St. Mary's Hospital Medical School until his retirement in 1954, serving as Emeritus Professor of Bacteriology from 1948 and principal of the Wright-Fleming Institute, where he pursued studies on mechanisms and bacterial resistance.

Awards and Honors

Fleming's most prestigious recognition came in 1945, when he was jointly awarded the in or with Boris Chain and Howard Walter Florey for the and its curative effect in various infectious diseases. This accolade highlighted his pivotal role in identifying the 's potential, though the prize also acknowledged the collaborative efforts in its development and clinical application. In 1944, Fleming was knighted by King George VI as a , becoming Sir Alexander Fleming, in recognition of his contributions to medical science during . He received numerous other honors, including the U.S. in 1945 and the French . Fleming was also conferred with nearly thirty honorary doctorates from universities across Europe and America, including from the , where he served as Rector from 1951 to 1954. Following his death in 1955, Fleming's legacy was commemorated through various tributes, including a bust installed at St Mary's Hospital in , where he conducted his groundbreaking research. Another bust resides in the collection of the National Galleries of Scotland in , honoring his Scottish roots and scientific impact. In 2025, additional recognitions marked the ongoing appreciation of Fleming's work. On April 11, a depicting him was unveiled in his birthplace of , , as part of local regeneration efforts to celebrate his . Later that year, on September 30, J D Wetherspoon opened a pub named The Sir Alexander Fleming in , , near the site of his laboratory, creating 70 jobs and serving as a modern homage to his contributions.

Legacy in Modern Medicine

Alexander Fleming's in 1928 ushered in the antibiotic era, fundamentally transforming modern medicine by providing the first effective treatment against a wide range of bacterial infections and drastically reducing mortality rates from previously lethal conditions. This breakthrough laid the foundation for the development of beta-lactam antibiotics, a class that includes semi-synthetic derivatives such as amoxicillin, which expanded penicillin's spectrum of activity and improved its pharmacological properties for broader clinical use. Beta-lactams, directly inspired by Fleming's work, remain the most prescribed class, accounting for over 60% of antibiotic prescriptions in recent decades due to their efficacy against common pathogens. In his 1945 Nobel Lecture, Fleming issued a prescient warning about the risks of , stating: "The time may come when penicillin can be bought by anyone in the shops. Then there is the danger that the ignorant man may easily underdose himself and by exposing his microbes to non-lethal quantities of the drug make them resistant." He emphasized that such practices could foster resistant strains, a prediction that has materialized in the contemporary global (AMR) crisis, exemplified by methicillin-resistant Staphylococcus aureus (MRSA), which causes hundreds of thousands of infections annually and complicates treatment worldwide. Fleming's early recognition of resistance mechanisms, including the ease of inducing it in settings, highlighted the need for judicious use, influencing ongoing efforts to combat overuse-driven resistance. Fleming's legacy extends to modern research and policy, where his work continues to drive the search for novel antimicrobials to address resistant pathogens, with penicillin derivatives still treating the majority of susceptible bacterial infections today. In the , his warnings have informed international AMR strategies, including the UK-led Fleming Fund, a major program supporting and in low- and middle-income countries to generate and share resistance data. Similarly, the Fleming Initiative integrates research, policy, and public engagement to tackle AMR as a global threat, underscoring Fleming's enduring role in shaping responses to this escalating health challenge.

Personal Life and Death

Family and Relationships

Alexander Fleming was born on August 6, 1881, at Lochfield near in , , as the third of four children from his father Hugh Fleming's second marriage to Grace Stirling Morton. His father had four surviving children from his first marriage, making Fleming part of a blended of eight siblings in total. He maintained close ties with his elder brother (Tom), an oculist who practiced on London's ; in 1895, at age 13, Fleming moved to to live with Tom and complete his education, a decision influenced by his brother's medical career. Another brother, John, also pursued and supported Fleming's early interests in science, though the family emphasized self-reliance on their farm. Fleming remained unmarried until December 24, 1915, when he wed Sarah Marion McElroy, a trained nurse from , , , whom he met while serving in the Royal Army Medical Corps during . The couple had one son, Robert Fleming, born on December 15, 1924, who later became a general medical practitioner in and died in 2015. Sarah provided steadfast support during Fleming's career, managing their household while he focused on laboratory work, and their marriage lasted until her death on October 28, 1949. Following Sarah's passing, Fleming married Greek microbiologist Amalia Koutsouri-Vourekas on April 9, 1953, in ; she was approximately 31 years his junior and had collaborated with him professionally at St. Mary's Hospital. The union produced no children, but Amalia remained a devoted companion in his final years, sharing interests in and travel. Throughout his life, Fleming was known for his reserved nature in personal matters, prioritizing family loyalty over social engagements.

Final Years and Passing

In 1954, Alexander Fleming retired from his position as director of the Wright-Fleming Institute of at St. Mary's Hospital , though he retained access to his and continued to engage in research activities there until his death. Despite stepping down from administrative duties, he remained active in the , delivering lectures—such as one in in November 1954—and collaborating on ongoing projects, including studies on with his wife, . He also expressed intentions to persist in microbiological pursuits, stating at a Society of Microbiology dinner in January 1955 that he had "not given up hope of reading a paper at one of your meetings." In his later years, Fleming traveled with Amalia, including a visit to in October 1952 where they toured , Salonica, , and other historical sites; he particularly cherished waking to the view of the from his hotel balcony. The couple had planned another extensive trip beginning March 17, 1955, to , , , and , in hopes that the would benefit his health. However, these plans were cut short when Fleming suffered a massive at his home in , on March 11, 1955, at the age of 73. He declined medical intervention and passed peacefully. Fleming's funeral took place on March 18, 1955, at in , where his ashes were interred in the crypt—a rare honor shared by figures such as Admiral Horatio Nelson and the Duke of Wellington. His ashes were marked simply with "A. F." on a , accompanied by a nearby Pentelic marble tablet bearing symbols of a and lily.

Myths and Misconceptions

The "Fleming Myth" of Sole Discovery

The "Fleming myth" refers to the widespread misconception that Alexander Fleming single-handedly discovered penicillin in through a serendipitous observation of mold inhibiting and immediately developed it into a viable capable of curing infections on the spot. In this narrative, Fleming is portrayed as a lone genius whose accidental finding led directly to a medical revolution, often ignoring the collaborative and protracted nature of the process. In reality, Fleming's initial observation of the antibacterial properties of notatum mold relied on input from his former assistant D. Merlin Pryce, who upon seeing the plate remarked on its similarity to the discovery, and subsequent culturing and testing involved laboratory support; Fleming himself, with assistants Stuart Craddock and Frederick Ridley, struggled to purify or stabilize it for practical use over the next decade. The breakthrough in isolation, purification, and clinical demonstration came from the team led by and at Oxford University, who in 1940 successfully extracted penicillin and conducted the first animal trials, followed by human tests that proved its life-saving potential against bacterial infections. Their work transformed Fleming's preliminary finding into a usable , a process that spanned over 12 years and involved additional contributors like Norman Heatley for production techniques. This myth was perpetuated by sensationalized media coverage in the 1940s, including articles in outlets like that emphasized Fleming's role while downplaying others, as well as newsreels and public announcements that favored dramatic individual stories over scientific teamwork; Florey's reluctance to engage with further amplified Fleming's prominence. The 1945 Nobel Prize in Physiology or Medicine, awarded jointly to Fleming, Florey, and , inadvertently reinforced the focus on Fleming due to his earlier association with the discovery and greater media accessibility. Fleming himself rejected the myth, describing his fame as the "Fleming myth" and consistently crediting his collaborators in public statements, such as his 1945 Nobel banquet speech where he stated, "It was ten years later that Florey and made up a complete at which succeeded in this and showed the marvellous chemotherapeutic properties of penicillin," and emphasized that " work may be absolutely necessary to bring the discovery to full advantage."

Connections to the Churchill Family

One persistent apocryphal tale claims that Alexander Fleming treated a young Winston Churchill for pneumonia in South Africa during the 1890s using early antiseptics, an act that supposedly inspired lasting gratitude from the Churchill family and influenced Fleming's later career. This story portrays the encounter as a pivotal moment of reciprocity, with Churchill's family later supporting Fleming in return. However, no historical records support this narrative; Fleming, born in 1881, was a teenager during the Boer War period when Churchill served as a correspondent in South Africa, and he had no medical role or presence there at the time. Another related myth asserts that Fleming saved Winston Churchill's grandson from a severe throat infection in the 1940s using penicillin, thereby repaying an earlier favor from the family. This version frames the event as a direct act of personal intervention by Fleming, emphasizing themes of kindness and historical irony. In reality, there are no documented cases of Fleming treating any member of the Churchill family with penicillin for such a condition, and medical records from the era do not corroborate the story. These anecdotes are part of a broader set of unfounded legends linking Fleming to the Churchills, often conflated with the false claim that penicillin cured Winston Churchill's 1943 pneumonia during . Churchill's illness occurred in Carthage, , and was treated successfully with M&B 693 (), a , under the care of his physician Lord Moran, without involvement from Fleming or penicillin, which was not yet widely available for clinical use. No evidence exists of Fleming treating Churchill or his relatives personally, and both men denied any such connections during their lifetimes. The origins of these myths likely stem from misattributed biographical anecdotes popularized in mid-20th-century publications, such as Arthur Keeney's article "Dr. Lifesaver" in Coronet magazine, which fabricated elements of reciprocity between the families to dramatize penicillin's impact. Fleming himself emphasized in interviews and writings that his discovery was the result of laboratory observation, not personal favors or family ties, and historians attribute the stories' persistence to wartime enhancing penicillin's heroic narrative.

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