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List of allergens
List of allergens
List of allergens
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This is a list of allergies, which includes the allergen, potential reactions, and a brief description of the cause where applicable.

Allergens

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Food

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Main article: Food allergy
Name Potential reaction(s) Remarks
Balsam of Peru Redness, swelling, itching, allergic contact dermatitis reactions, stomatitis (inflammation and soreness of the mouth or tongue), cheilitis (inflammation, rash, or painful erosion of the lips, oropharyngeal mucosa, or angles of their mouth), pruritus, hand eczema, generalized or resistant plantar dermatitis, rhinitis, conjunctivitis, and blisters. Present in many foods, such as coffee, flavored tea, wine, beer, gin, liqueurs, apéritifs (e.g. vermouth, bitters), soft drinks including cola, juice, citrus, citrus fruit peel, marmalade, tomatoes and tomato-containing products, Mexican and Italian foods with red sauces, ketchup, spices (e.g. cloves, Jamaica pepper (allspice), cinnamon, nutmeg, paprika, curry, anise, and ginger), chili sauce, barbecue sauce, chutney, pickles, pickled vegetables, chocolate, vanilla, baked goods and pastries, pudding, ice cream, chewing gum, and candy.
Buckwheat[1] Asthma, rhinitis, pruritus, gastrointestinal disturbances, urticaria, angioedema, shock, anaphylaxis[2] Allergenicity is highest in Japan and Korea.[3] It is estimated that buckwheat causes 5% of all immediate-type allergic reaction cases (from food) in Japan.[4] Hazard extends to inhalation of milled flour particles (aeroallergen). Irrespective of the nomenclature, it is not a wheaten cereal; the name refers to its viability as a pseudocereal. Relating or conflating buckwheat allergy with wheat allergy or Triticeae hypersensitivities should be avoided.[5]
Celery Abdominal pain, nausea, vomiting, oral allergy syndrome, urticaria, neck or facial swelling, severe asthma symptoms, exercise induced anaphylaxis, potentially fatal anaphylactic shocks[6] Higher risk of provoking life-threatening reactions compared to most other food allergies. Celery seeds and celeriac are more allergenic than celery stalks.[7][8] Some individuals become cross-sensitized to other spices and herbs in the parsley family. Prevalence is high among adults in Central Europe. It is estimated that two-fifths of all Swiss food-allergy patients react to celery tubers and nearly a third of severe food allergy reactions in France may be due to celery.[9]
Egg Anaphylaxis, swelling, sometimes flatulence and vomiting An allergic individual may not have any reaction to consuming food only prepared with egg yolk and not egg white, or vice versa.[10] Due to high protein content, egg white allergy is more common than the reverse.[11] The majority of children with this allergy become tolerant by adulthood.[12]
Fish Respiratory reactions, Anaphylaxis, oral allergy syndrome, sometimes vomiting One of three allergies to seafood, not to be conflated with allergies to crustaceans and mollusks.[13] People with fish allergies have a 50% likelihood of being cross reactive with another fish species,[14] but some individuals are only allergic to one species, such as; tilapia[15] salmon,[13] or cod. A proper diagnosis is considered complicated due to these cross reactivity between fish species and other seafood allergies.[16] Hazard extends to exposure to cooking vapors or handling.[17]
Fruit Mild itching, rash, generalized urticaria, oral allergy syndrome, abdominal pain, vomiting, anaphylaxis Mango, strawberries, banana,[18] avocado, and kiwi are common problems.[19] Severe allergies to tomatoes have also been reported.[20][21] Stone fruits are highly cross-reactive with one another, as are the rosaceae fruits [22][10] Reaction to hot peppers, a kind of botanical berry, is another specific type of fruit allergy.
Garlic Dermatitis, rhinitis, asthma, urticaria, asymmetrical pattern of fissure, thickening/shedding of the outer skin layers,[23] rarely anaphylaxis Very few garlic allergens have been reported, and garlic allergy has been rarely studied. Some garlic-allergic individuals may cross-react with leek, shallot and onion. Garlic that has been heated/cooked is less allergenic than raw garlic.[24][25]
Oats Dermatitis, respiratory problems, anaphylaxis Risk extends to respiratory inhalation. Oat is not a triticeae cereal but it is possible for individuals with gluten-related disorders to be misdiagnosed as having a hypersensitivity to pure oat because cross-contamination is very common in the western world.
Maize Hives, pallor, confusion, dizziness, stomach pain, swelling, vomiting, indigestion, diarrhea, cough, tightness in throat, wheezing, shortness of breath, anaphylaxis Often a difficult allergy to manage due to the various food products which contain various forms of maize.
Milk[26] Skin rash, hives, vomiting, diarrhea, constipation, stomach pain, flatulence, colitis, nasal congestion, dermatitis, blisters, migraine, anaphylaxis Not to be confused with lactose intolerance.[27] Allergy to cow's milk is the most common food allergy in infants and young children[11] but most outgrow the allergy in early childhood. Introducing baked cow's milk to allergic patients is associated with accelerated resolution of milk allergy.[28] Some evidence suggests goat's milk has less allergenic potential than cow's milk[29] and reduced risk of allergy development if infants are weaned with goat's milk.[30] Due to adult-onset sensitization it is estimated to be the second most common food allergy in American adults.[31]
Mustard Eczema, Rash, Hives, Facial swelling, Other skin reactions, Oral allergy syndrome, Conjunctivitis, Wheezing, Abdominal pain, Diarrhea, Nausea, Vomiting, Acid Reflux, Dizziness, Asthma, Chest pain, Respiratory problems, Anaphylaxis Mustard allergy onset is usually in infancy or toddlerhood;[32] it is seemingly very rare but true prevalence can not be established due to several tests producing high rates of false positives.[33] Due to a gradual increase in prevalence[34] and the severity of known reactions it became recognized as the 11th priority allergen by Canada in 2009,[35] and a top 14 priority allergen by the European Union in 2014.[36][37]
Peanut[38] Anaphylaxis and swelling, sometimes vomiting Includes some cold-pressed peanut oils. Distinct from tree nut allergy, as peanuts are legumes. Reactions are often severe or fatal.
Poultry Meat[39] Hives, swelling of, or under the dermis, nausea, vomiting, diarrhea, severe oral allergy syndrome, shortness of breath, rarely anaphylactic shock Very rare allergies to chicken, turkey, squab, and sometimes more mildly to other avian meats. Not to be confused with secondary reactions of bird-egg syndrome. The genuine allergy has no causal relationship with egg allergy, nor is there any close association with red meat allergy. Prevalence still unknown as of 2016.[40]
Red Meat[41] Hives, swelling, dermatitis, stomach pain, nausea, vomiting, dizziness, fainting, shortness of breath,[42] anaphylaxis Allergies to the sugar carbohydrate found in beef, venison, lamb, and pork called alpha-gal. It is brought on by tick bites.[43] Allergic reaction to pork is an exception, as it may also be caused by pork-cat syndrome instead of alpha-gal allergy.
Rice Sneezing, runny nose, itching, stomachache, eczema. People with a rice allergy can be affected by eating rice or breathing in rice steam.
Sesame Possible respiratory, skin, and gastrointestinal reactions which can trigger serious systemic anaphylactic responses.[44][45] By law, foods containing sesame must be labeled so in European Union, Canada, Australia, and New Zealand.[44] Increasing prevalence has led to it being deemed the ninth most common food allergen in the United States in 2019. Highest prevalence by age was among 18-29 year olds and an estimated 80% of all sesame-allergic patients had a comorbid food allergy.[46] In 2018, the US FDA issued a request for information for the consideration of labeling for sesame to help protect people who have sesame allergies.[47] A decision was reached in November 2020 that food manufacturers voluntarily declare that when powdered sesame seeds are used as a previously unspecified spice or flavor, the label be changed to "spice (sesame)" or "flavor (sesame)".[48] Via congressional act, it was declared that food manufacturers must acknowledge sesame as a priority food allergen by the 2023 deadline.[49]
Shellfish Respiratory symptoms, Anaphylaxis, oral allergy syndrome, gastrointestinal symptoms, rhinitis, conjunctivitis Shellfish allergies are highly cross reactive, but its prevalence is much higher than that of fish allergy. Shellfish allergy is the leading cause of food allergy in U.S adults.[31] As of 2018 six allergens have been identified to prawn alone; along with crab, it is the major culprit of seafood anaphylaxis.[13] In reference to it as one of the "Big 8"[50] or "major 14" allergens it is sometimes specified as a "crustacean shellfish" allergy, or more simply, a "crustacean allergy".[51][52] Sometimes it is conflated with an allergy to molluscan shellfish but complete tolerance to one but not the other is not uncommon. Most usually, a mono-sensitive individual will experience a crustacean allergy alone with tolerance to mollusks, rather than vice versa.[13] The symptoms of an allergic reaction to molluscan shellfish should not be confused with the effects of shellfish poisoning which are a medical reactions that manifest after eating contaminated mollusks from certain areas of the world and lasts for several hours or days after onset.[53]
Soy Anaphylaxis, asthma exacerbation, rhinitis, allergic conjunctivitis, hives, atopic dermatitis, swelling of, or under the dermis, diarrhea, nausea, vomiting Overall is lower in prevalence than both peanut allergy and cow's milk allergy. However, due to similar protein structures soya is a common cross-reactive allergen in both peanut-allergic individuals and milk-allergic individuals; especially infants.[54]
Sulfites Hives, rash, redness of skin, headache (particular frontal), burning behind eyes, asthma-like breathing difficulties, anaphylaxis Sulfites (also spelled "sulphites") are used as a preserving agents in many different foods, such as raisins, dried peaches, various other dried fruit, canned or frozen fruits and vegetables, wines, vinegars and processed meats. Allergy appears to be very rare in the general population but it is still often considered to be one of the top 10 food allergies.[55] It is debated whether reaction to sulfites is a true allergy.[56]
Tartrazine Skin irritation, hives, rash A synthetic food dye used in processed foods like confections, soft drinks, flavoring syrups, condiments and convenience foods in order to create a potent yellow or bright green coloring. Prevalence of allergenicity is unclear but it is the most likely azo dye to cause hypersensitivity and reactions may occur from ingestion or skin contact. It is possible for some individuals to become desensitized. There is no strong evidence suggesting that tartrazine can cause hypersensitivity or intolerance in non-allergic individuals.
Tree nut[57] Anaphylaxis, swelling, rash, hives, sometimes vomiting Hazard extends to exposure to cooking vapors, or handling. Distinct from peanut allergy, as peanuts are legumes.
Wheat[58] Eczema (atopic dermatitis), Hives, asthma, "baker's asthma", hay fever, oral allergy syndrome, angioedema, abdominal cramps, Celiac disease, diarrhea, temporary (3 or 4 day) mental incompetence, anemia, nausea, vomiting and exercise induced anaphylaxis [59] Risk extends to wheat hybrids like triticale.[55] True wheat allergies are very rare; it is estimated to effect 0.1%-2.2% of individuals depending on region.[60] The allergy does not commonly persist into adolescence. Gluten-free foods are safer for wheat allergic patients but they still may theoretically contain wheat's other allergenic proteins.[61] Wheat allergy symptoms should not be confused with celiac disease, gluten ataxia or non-celiac gluten sensitivity (NCGS). While wheat allergies are "true" allergies, celiac disease and gluten ataxia are an autoimmune diseases.[62] NCGS is more similar to food intolerances but as of 2021 its pathogenesis is still not well understood.

Medical

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Main article: Drug allergy
Name Possible reaction(s) Remarks
Balsam of Peru Redness, swelling, itching, allergic contact dermatitis reactions, stomatitis (inflammation and soreness of the mouth or tongue), cheilitis (inflammation, rash, or painful erosion of the lips, oropharyngeal mucosa, or angles of their mouth), pruritus, hand eczema, generalized or resistant plantar dermatitis, rhinitis, conjunctivitis, and blisters. Present in many drugs, such as hemorrhoid suppositories and ointment (e.g. Anusol), cough medicine/suppressant and lozenges, diaper rash ointments, oral and lip ointments, tincture of benzoin, wound spray (it has been reported to inhibit Mycobacterium tuberculosis as well as the common ulcer-causing bacteria H. pylori in test-tube studies), calamine lotion, surgical dressings, dental cement, eugenol used by dentists, some periodontal impression materials, and in the treatment of dry socket in dentistry.
Tetracycline Many, including: severe headache, dizziness, blurred vision, fever, chills, body aches, flu symptoms, severe blistering, peeling, dark colored urine[63][64]
Dilantin Many, including: swollen glands, easy bruising or bleeding, fever, sore throat[65][66][67]
Tegretol (carbamazepine) Shortness of breath, wheezing or difficulty breathing, swelling of the face, lips, tongue etc., hives[68][69][70]
Penicillin Diarrhea, hypersensitivity, nausea, rash, neurotoxicity, urticaria
Cephalosporins Maculopapular or morbilliform skin eruption, and less commonly urticaria, eosinophilia, serum-sickness–like reactions, and anaphylaxis.[71]
Sulfonamides Urinary tract disorders, haemopoietic disorders, porphyria and hypersensitivity reactions, Stevens–Johnson syndrome toxic epidermal necrolysis
Non-steroidal anti-inflammatories (cromolyn sodium, nedocromil sodium, etc.) Many, including: swollen eyes, lips, or tongue, difficulty swallowing, shortness of breath, rapid heart rate[72]
Intravenous contrast dye Anaphylactoid reactions and contrast-induced nephropathy
Local anesthetics Urticaria and rash, dyspnea, wheezing, flushing, cyanosis, tachycardia[73]

Environmental

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Main article: Allergy § Other environmental factors
Name Possible reaction(s) Remarks
Balsam of Peru Redness, swelling, itching, allergic contact dermatitis reactions, stomatitis (inflammation and soreness of the mouth or tongue), cheilitis (inflammation, rash, or painful erosion of the lips, oropharyngeal mucosa, or angles of their mouth), pruritus, hand eczema, generalized or resistant plantar dermatitis, rhinitis, conjunctivitis, and blisters. A number of national and international surveys have identified Balsam of Peru as being in the "top five" allergens causing patch test reactions in people referred to dermatology clinics.[74][75]
Pollen Sneezing, body ache, headache (in rare cases, extremely painful cluster headaches may occur due to allergic sinusitis; these may leave a temporary time period of 1 and a half to 2 days with eye sensitivity), allergic conjunctivitis (includes watery, red, swelled, itchy, and irritating eyes), runny nose, irritation of the nose, nasal congestion, minor fatigue, chest pain and discomfort, coughing, sore throat, facial discomfort (feeling of stuffed face) due to allergic sinusitis, possible asthma attack, wheezing
Cat Sneezing, itchy swollen eyes, rash, congestion, wheezing
Dog Rash, sneezing, congestion, wheezing, vomiting from coughing, Sometimes itchy welts. Caused by dander, saliva or urine of dogs, or by dust, pollen or other allergens that have been carried on the fur.[76] Allergy to dogs is present in as much as 10 percent of the population.[76]
Insect sting Hives, wheezing, possible anaphylaxis Possible from bee or wasp stings, or bites from mosquitoes or flies like Leptoconops torrens.
Mold Sneeze, coughing, itchy, discharge from the nose, respiratory irritation, congested feeling,[77] joint aches, headaches, fatigue[78]
Perfume Itchy eyes, runny nose, sore throat, headaches, muscle/joint pain, asthma attack, wheezing, chest pain, blisters
Cosmetics Contact dermatitis,[79] irritant contact dermatitis, inflammation, redness,[80] conjunctivitis,[81] sneezing
Semen Burning, pain and swelling, possibly for days, swelling or blisters, vaginal redness,[82] fever, runny nose, extreme fatigue[83][84][85][86][87] In a case study in Switzerland, a woman who was allergic to Balsam of Peru was allergic to her boyfriend's semen following intercourse, after he drank large amounts of Coca-Cola.[88]
Latex Contact dermatitis, hypersensitivity
Water (see note) Epidermal itching, swelling of the oral cavity after drinking water, anaphylaxis (in severe cases)[89][90][91][92][93] Strictly aquagenic pruritus or aquagenic urticaria, but cold water may also cause cold urticaria
Cold stimuli Hives, itching Known as cold urticaria
House dust mite[94] Asthma Home allergen reduction may be recommended
Nickel (nickel sulfate hexahydrate) Allergic contact dermatitis, dyshidrotic eczema[95][96]
Gold (gold sodium thiosulfate) Allergic contact dermatitis
Chromium Allergic contact dermatitis
Cobalt chloride Allergic contact dermatitis
Formaldehyde Allergic contact dermatitis
Photographic developers Allergic contact dermatitis
Fungicide Allergic contact dermatitis, fever, anaphylaxis

Contact

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Many substances can cause an allergic reaction when in contact with the human integumentary system.

Contact allergens
Allergen Source Cross reacts with Clinical presentation
Dimethylaminopropylamine (DMAPA) Found within cocamidopropyl betaine in liquid soaps and shampoos Eyelid dermatitis
Latex[nb 1] Avocado
Banana
Chestnut
Kiwi
Passion fruit
Peach
Mango
Pineapple
Fig
Cantaloupe
Apple
Papaya
Ethylene-ripened fruits
Paraphenylenediamine (PPD) Black hair dye
Color developer
Scuba gear
Henna[nb 2]		 Para-aminobenzoic acid (PABA)
Azo dyes
Sulfonamides
Sulfonylureas
Thiazides
Ester anesthetics
Glyceryl monothioglycolate Permanent hair waving solutions
Tosylamide/formaldehyde resin (TSFR) Nail polish Eyelid dermatitis
p-tert-butylphenol-formaldehyde resin (PTBP-FR) Adhesive in craft glues and commercial leather and rubber products Foot dermatitis[97][98]: 793 
  1. ^ Risk factors for reaction to latex include spina bifida, family history of allergy to latex, or a personal history of allergies, asthma, or eczema
  2. ^ Paraphenylenediamine may be added to henna but is not found in pure henna.

See also

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References

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Further reading

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Revisions and contributorsEdit on WikipediaRead on Wikipedia

List of allergens

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from Grokipedia
A list of allergens is a catalog of substances that can trigger an overreaction in sensitized individuals, leading to symptoms ranging from mild irritation to life-threatening . These substances, known as allergens, are typically harmless to most people but provoke the release of and other chemicals when encountered by those with allergies. Allergens are diverse and can enter the body through inhalation, ingestion, skin contact, or injection, affecting millions globally and contributing to conditions like , , eczema, and food . Allergens are commonly categorized by their source and route of exposure to facilitate identification, avoidance, and management strategies. Food allergens represent one major group, with the U.S. designating nine priority allergens responsible for most reactions: , eggs, , crustacean shellfish, tree nuts, , , soybeans, and . Airborne or inhalant allergens, another prevalent category, include from trees, grasses, and weeds; mites; ; mold spores; and debris, often exacerbating respiratory issues like hay fever and . Contact allergens primarily affect the skin, causing dermatitis upon direct exposure, with common examples including latex, nickel, fragrances, and preservatives in cosmetics or textiles. Injectable allergens, such as venom from insect stings (e.g., bees and wasps) or certain medications like penicillin, can lead to systemic reactions including hives or anaphylaxis. Comprehensive lists of allergens, such as those maintained by health authorities, aid in labeling requirements, diagnostic testing, and public health education to mitigate risks.

Food Allergens

Major Food Allergens

Major food allergens are defined as those substances responsible for approximately 90% of food allergy reactions worldwide, primarily involving (IgE)-mediated immune responses to specific proteins in foods. In the United States, the (FDA) designates nine major food allergens—, eggs, , crustacean , tree nuts, , , soybeans, and —as the "Big 9," which must be clearly labeled on packaged foods to protect consumers. These allergens trigger reactions upon ingestion, ranging from mild symptoms to life-threatening , and account for the majority of reported cases in both children and adults. In the US, these Big 9 allergens are estimated to affect about 33 million people as of , with food allergies impacting roughly 8% of children and 10% of adults overall. Globally, the prevalence varies, but the core group consistently drives most reactions; for instance, and tree nut allergies have risen notably in recent decades. In the , labeling requirements cover 14 priority allergens, including the US Big 9 plus , mustard, lupin, molluscs, and certain fruits/nuts, reflecting regional dietary patterns and risks. Common reactions include skin manifestations like or eczema, gastrointestinal issues such as and , and respiratory symptoms like wheezing, with —characterized by rapid onset of , airway swelling, and shock—occurring in up to 30% of cases for severe allergens like . Milk allergy, primarily to and proteins, affects 2-3% of infants and is the most common in young children, though up to 80% outgrow it by adolescence. Egg allergy, driven by ovalbumin and other proteins in , is the second most prevalent in children (affecting about 1-2%), often resolving by school age but capable of causing severe reactions. Peanut allergy involves Ara h 1, 2, and 3 proteins and impacts around 2% of children, frequently persisting lifelong with a high risk of due to trace exposures. Tree nuts, such as almonds, , and cashews, elicit reactions via homologous proteins like vicilins and 2S albumins, affecting 1% of the population with notable among nut types (e.g., and ). Fish allergy, linked to parvalbumin in muscle tissue, is more common in adults (about 0.5% prevalence) and often lifelong, with reactions from even cooked fish. Crustacean shellfish, including , , and , reacts via and affects 2-3% of adults, particularly those with exposure, leading to potent anaphylactic responses. Wheat allergy targets proteins like and is distinct from celiac disease, impacting 0.4% globally and causing immediate IgE-mediated symptoms. Soy allergy, to Gly m 5 and 6 proteins, occurs in 0.4% of children, often alongside in infants. Sesame allergy, involving 2S albumins like Ses i 1, affects 0.2-0.5% worldwide and was designated as the ninth major allergen by the FASTER Act of 2021, with labeling requirements effective January 1, 2023. Recent FDA guidance in 2025 explicitly states that is not a nut allergen due to its low sensitization risk and botanical distinction.

Emerging and Regional Food Allergens

Emerging food allergens are defined as food components that have gained increased recognition through recent scientific studies, epidemiological shifts, or environmental factors, often leading to outbreaks or rising incidence in specific populations, in contrast to well-established major allergens. These allergens typically exhibit lower global prevalence but are becoming more significant due to changes in food production, dietary trends, and climate-influenced exposures. A key example is , an IgE-mediated to the galactose-α-1,3-galactose (α-Gal) present in mammalian meats such as , pork, and lamb. This condition is primarily triggered by bites from the lone star tick (), with cases emerging in the United States since 2009. By 2023, estimates indicated that over 450,000 individuals in the US were affected, with prevalence rising in correlation with expanding tick populations due to and habitat alterations. Reactions often manifest as delayed , occurring 3 to 6 hours after ingestion, distinguishing it from typical immediate food allergies; symptoms can include , gastrointestinal distress, and severe . Regional variations in severity are noted, with higher incidence and intensity in southeastern US states where the tick is endemic. Lupin, derived from the legume species, contains allergenic proteins such as β-conglutin that can provoke severe reactions, including , and exhibits with allergens due to shared protein structures. In the , lupin has been a mandated labeling since 2008 under Regulation (EC) No 41/2000, extended by Regulation (EU) No 1169/2011, reflecting its growing use in gluten-free and protein-enriched products. Prevalence of lupin allergy is increasing, particularly in , as its incorporation into baked goods and meat alternatives rises with demand for plant-based and gluten-free diets; reported cases have doubled in some EU countries over the past decade. Molluscs, including , , and mussels, are recognized as distinct allergens in the EU, separate from shellfish, primarily due to proteins that share structural similarities with those in and , leading to in sensitized individuals. EU labeling requirements under Regulation (EU) No 1169/2011 highlight their regional importance, especially in Mediterranean diets where consumption is high. Allergic reactions range from mild oral symptoms to severe , with higher rates reported in coastal European populations compared to global averages. Celery (Apium graveolens) contains the major allergen Api g 1, a profilin that commonly triggers reactions in Europe, where it affects up to 10% of birch pollen-allergic individuals through cross-reactivity. This vegetable is a priority in Central and Northern Europe, often causing oral allergy syndrome or more severe systemic responses in polysensitized patients. Mustard, encompassing seeds from Sinapis alba (white mustard) and Brassica nigra (black mustard), features the 2S albumin allergen Sin a 1, which is prioritized in the EU for its potential to induce severe, life-threatening reactions even in trace amounts. Labeling is required under EU regulations, with notable prevalence in Southern Europe and among spice consumers. Sulphites, used as preservatives in wines, dried fruits, and processed foods, can elicit IgE-independent reactions like bronchospasm, particularly in asthmatic individuals, affecting approximately 3-10% of asthmatics globally but with higher reporting in wine-producing regions. They are subject to threshold-based labeling in the EU and Australia. In Asia, buckwheat (Fagopyrum esculentum) is a prominent regional allergen, with the cupin-like protein Fag e 1 responsible for anaphylactic reactions in up to 0.2-1% of the population in Japan and Korea, where it is a staple in soba noodles. Sensitization often occurs through inhalation during processing but manifests via ingestion. Certain fruits, such as mango and strawberry, contain profilin allergens (e.g., Man i 1 in mango and Fra a 4 in strawberry) that frequently trigger oral allergy syndrome in individuals sensitized to grass or birch pollen, leading to localized itching or swelling upon ingestion. These are more commonly reported in tropical and temperate regions with high fruit consumption.

Inhalant Allergens

Outdoor Inhalant Allergens

Outdoor inhalant allergens are airborne particles encountered in external environments, primarily consisting of pollens from wind-pollinated plants and fungal spores, which trigger seasonal allergic responses upon inhalation. These aeroallergens are heavily influenced by weather patterns, such as temperature, humidity, and wind, leading to episodic exposure during specific times of the year. Tree pollens represent a primary category of outdoor allergens, with (Betula) and (Quercus) species being prominent examples in temperate zones. The major in pollen is Bet v 1, a that elicits IgE responses in up to 95% of sensitized individuals in Central and . pollen allergy affects 8-16% of the population in these regions, contributing significantly to early spring symptoms. pollen, part of the order, shares cross-reactive allergens and similarly impacts respiratory health during blooming periods. Grass pollens, such as those from ryegrass () and timothy (Phleum pratense), dominate mid-season exposures, peaking in late spring and early summer. Phl p 1, a allergen in timothy grass, is recognized by over 90% of grass pollen-allergic patients and exhibits high across temperate grass species. Ryegrass allergens, including homologous group 1 proteins, are particularly relevant in regions like and , where they drive symptoms during warm months. Weed pollens from plants like (Ambrosia artemisiifolia) and (Artemisia vulgaris) are key late-season contributors, often peaking in summer and fall. Amb a 1, the predominant in , provokes reactions in more than 90% of sensitized individuals and shows elevated production under rising CO2 levels associated with . Mugwort pollen allergens, including Art v 1, similarly increase in allergenicity with environmental shifts, exacerbating exposures in invaded areas. Outdoor fungal spores, particularly from molds like , add to loads in temperate and humid climates, with seasonal peaks during warm, dry summers. spores are among the most frequently detected outdoor fungal allergens, correlating with higher concentrations in areas of moderate and . These spores disseminate widely via air currents, contributing to allergic sensitization in outdoor settings. Pollen allergies from outdoor sources affect 10-30% of the global population, manifesting as . sensitization in is projected to more than double by mid-century due to warming temperatures, from approximately 33 million to 77 million people, with recent models indicating up to a 60% increase in northwest . Exposure to these allergens commonly induces hay fever, characterized by allergic rhinitis with symptoms including nasal congestion, sneezing, and rhinorrhea, alongside conjunctivitis causing itchy, watery eyes. In susceptible individuals, inhalant allergens can exacerbate asthma, leading to wheezing, shortness of breath, and acute attacks, with symptom duration aligning with pollen and spore seasons that vary by region and plant type. Climate change has prolonged pollen seasons by an average of 20 days since 1990, accompanied by a 21% rise in pollen concentrations, as evidenced by long-term monitoring data from and . These extensions, driven by warmer temperatures and altered , intensify exposure risks and correlate with increased prevalence in affected populations. Cross-reactivity between birch pollen allergens like Bet v 1 and certain fresh fruits can lead to , causing mild oral symptoms upon ingestion.

Indoor Inhalant Allergens

Indoor allergens refer to airborne particles present in residential environments that trigger allergic responses year-round, primarily through constant exposure in homes where individuals spend significant time. These allergens, unlike seasonal outdoor triggers, provide perennial exposure that can lead to chronic and symptoms in susceptible individuals. Common sources include biological materials from mites, animals, , and fungi that become aerosolized and inhaled. House dust mites, particularly species such as Dermatophagoides pteronyssinus and D. farinae, are among the most prevalent indoor . The primary , Der p 1 from D. pteronyssinus, is a proteolytic found in and body fragments that become airborne in household dust. These mites thrive in environments with relative humidity above 50-65%, where they feed on scales and reproduce rapidly in , carpets, and upholstered furniture. Animal allergens arise from proteins in the skin, , and urine of household pets, with from cats and Can f 1 from dogs being the major culprits. is produced in salivary and sebaceous glands and adheres to , becoming airborne on small particles that remain suspended for extended periods. Can f 1 similarly spreads via and , persisting in homes even after pet removal. Sensitization to these allergens affects approximately 20–30% of individuals with , contributing to in both pet owners and those exposed indirectly through contaminated environments. Cockroach allergens, notably Bla g 2 from species like Blattella germanica, are significant in urban settings with high infestation rates. Bla g 2, a glucose dehydrogenase in , , and body parts, becomes airborne in dust and is particularly prevalent in low-income inner-city homes. to allergens is linked to increased morbidity in children, with exposure exacerbating symptoms through chronic . Recent studies highlight allergens as an emerging concern in densely populated areas, where is essential for control. Indoor molds, such as and species, release allergenic spores that proliferate in damp, poorly ventilated areas like bathrooms and basements. These spores, measuring 2-10 micrometers, are easily inhaled and can trigger immune responses in sensitized individuals. Mold growth is favored by humidity levels above 60% and , making it a persistent issue in humid climates or water-leaking structures. Dust mite allergens are implicated in up to 50% of cases of indoor allergen-related and in temperate regions, underscoring their dominant role in perennial allergies. sensitivity affects 60-80% of inner-city children with in the United States, based on skin prick testing and IgE assays, with 2023 data confirming persistent high prevalence in urban low-income . Exposure to these indoor inhalant allergens primarily causes perennial , characterized by nasal congestion, sneezing, and itching, as well as asthma exacerbations including wheezing and . Sensitization occurs through repeated inhalation of allergen particles, leading to IgE-mediated immune responses that amplify subsequent exposures. In asthmatic individuals, these allergens can provoke bronchial hyperreactivity, with combined indoor and occasional outdoor flares worsening symptoms year-round.

Contact Allergens

Chemical Contact Allergens

Chemical contact allergens are low-molecular-weight synthetic substances that function as haptens, binding to skin proteins to form complete antigens that elicit a type IV delayed reaction mediated by T cells. This typically manifests as , an inflammatory characterized by redness, itching, and vesiculation at the site of exposure. Unlike , which occurs immediately upon exposure, allergic reactions require prior and develop over time with repeated contact. Among the most prevalent chemical contact allergens are metals such as , commonly found in jewelry, coins, and fasteners, which sensitizes approximately 10-15% of women due to frequent exposure from ear piercings and accessories. tops the list in patch testing for , accounting for about 20% of positive reactions in evaluated patients. , present in leather tanning processes, , and chrome-plated objects, induces reactions in 1-3% of patch-tested individuals, often linked to occupational exposure in and . , used in metal alloys, dyes, and pigments, frequently co-sensitizes with and affects around 5-10% of those with metal allergies. Other common allergens include , a and cross-linking agent in , textiles, and building materials, which causes reactions in 2-3% of patch-tested patients through direct irritation or . Paraphenylenediamine (PPD), a key ingredient in oxidative hair dyes and temporary black tattoos, has seen rising rates, with prevalence increasing from 0.6% in the general population to 3.2% among temporary users due to unregulated high concentrations in such products. Fragrances, such as those derived from (a containing compounds related to and ), are ubiquitous in perfumes, lotions, and household products, eliciting positive patch tests in 2-5% of cases and often indicating broader fragrance sensitivity. like tosylamide in nail polishes contribute to 1-2% of cosmetic-related allergies, particularly among frequent users. These allergens provoke eczematous , featuring , , and vesicles that appear 48-72 hours after exposure, with symptoms persisting or spreading upon re-exposure. Occupational links are prominent, as seen with in wet cement causing chronic hand in builders or PPD in hairdressers leading to facial and hand eruptions. may occur with structurally similar drugs like sulfonamides, complicating management in sensitized individuals. In recent updates as of , the has maintained strict limits on PPD in cosmetics under Regulation (EC) No 1223/2009, capping concentrations at 2% in ready-for-use hair dyes and prohibiting it in products applied near the eyes, with ongoing amendments to enhance labeling and monitoring amid rising tattoo-related incidents.

Biological Contact Allergens

Biological contact allergens refer to proteins or natural extracts derived from living organisms that can sensitize the upon direct contact, triggering type I (immediate) or type IV (delayed) reactions such as urticaria, , or . These allergens differ from chemical haptens by originating from biological sources like , animals, or human fluids, often requiring binding to skin proteins to elicit immune responses. Latex, derived from the sap of the Hevea brasiliensis rubber tree, contains allergenic proteins such as Hev b 1 through Hev b 6 that cause IgE-mediated contact urticaria or delayed upon skin exposure. Prevalence among healthcare workers, who face frequent exposure via gloves, averages 9.7% globally, though estimates range from 4% to 12% depending on region and study. Reactions include localized , eczema, or severe , with occupational cases declining significantly after the 2000 U.S. powder ban on latex gloves reduced airborne protein exposure. However, latex allergy persists at higher rates in tropical regions like (13.3% in healthcare workers) and (16.3%), where production and limited adoption of alternatives sustain exposure risks. , known as latex-fruit syndrome, affects up to 50% of latex-allergic individuals, linking Hevea proteins to those in , , and kiwi, exacerbating symptoms via oral or contact routes. Plants from the genus, such as (), release , an containing pentadecylcatechols that penetrates the skin and binds to proteins, inducing delayed-type in sensitized individuals. Approximately 50% to 75% of the U.S. adult population shows clinical sensitivity upon exposure, manifesting as intense pruritus, erythematous vesicles, and bullae that peak 1-3 days post-contact and resolve over 2-3 weeks without intervention. Similarly, members of the Compositae () family, including (), produce sesquiterpene lactones that cause through direct handling of leaves or flowers, with a mean of 1.5% in patch-tested populations (ranging 0.1-2.7%). These plant-derived allergens highlight the role of natural extracts in occupational and recreational exposures, often leading to linear or streaky rashes at contact sites. Human seminal plasma hypersensitivity (HSP), triggered by proteins like in , represents a rare but clinically significant biological contact affecting the vaginal mucosa or systemic circulation post-intercourse. Prevalence is difficult to quantify due to underreporting, but surveys suggest it impacts around 40,000 women in the U.S., with symptoms appearing in roughly half of cases after first exposure and preventable by use. Localized reactions include vulvovaginitis with burning and swelling within minutes, while systemic forms present as urticaria, , or shortly after contact, underscoring the need for testing in recurrent postcoital symptoms. Gold, though a metallic element in jewelry, can function as a biological contact when ionized forms bind to or extracellular proteins, eliciting delayed primarily on eyelids, face, or earlobes. Positive patch tests to occur in 5-10% of patients, with reactions resembling eczematous plaques that persist due to cumulative exposure from alloys. This protein-bound mechanism bridges metallic haptens and biological pathways, though it remains distinct from purely organic triggers.

Drug Allergens

Antibiotic Drug Allergens

Antibiotic drug allergens refer to antibiotics that elicit hypersensitivity reactions, primarily through IgE-mediated (type I) or T-cell-mediated (type IV) immune responses. These reactions occur when the drug or its metabolites act as haptens, binding to proteins to form immunogenic complexes that trigger immune activation. IgE-mediated responses involve mast cell degranulation leading to immediate symptoms, while T-cell responses cause delayed cutaneous or systemic manifestations. Among antibiotics, beta-lactams are the most common allergens. Penicillin, particularly , is associated with reported allergies in approximately 10% of patients, though true IgE-mediated is confirmed in less than 1% upon testing, with most labels stemming from non-allergic adverse events like viral rashes. Cephalosporins exhibit with penicillins in 2-5% of confirmed cases, primarily due to shared side chains, though overall true prevalence is low (around 1-3%), manifesting as urticaria or . Sulfonamides, such as trimethoprim-sulfamethoxazole, carry a higher of severe T-cell-mediated reactions, including Stevens-Johnson (SJS), accounting for about 32% of antibiotic-induced SJS/ cases. Tetracyclines, including and , rarely cause , with reported in isolated cases and an overall reaction rate below 0.5%. Hypersensitivity reactions to antibiotics range from mild cutaneous eruptions to life-threatening . IgE-mediated , most linked to beta-lactams, occurs within minutes of exposure and involves release, potentially leading to and respiratory distress. T-cell-mediated reactions, common with sulfonamides, present as maculopapular rashes or severe syndromes like SJS days after initiation. Over-diagnosis of antibiotic allergies, especially penicillin, contributes to broader-spectrum use, fostering and increased healthcare costs. Diagnosis relies on detailed and skin testing protocols, particularly for beta-lactams. Penicillin skin testing uses like benzylpenicilloyl and penicillin G, with intradermal tests confirming IgE ; a negative result has over 99% negative predictive value for safe re-administration. For cephalosporins and others, challenge tests may follow negative skin tests. Recent 2025 guidelines emphasize delabeling programs through multidisciplinary approaches, including risk stratification and direct oral challenges for low-risk patients, to safely remove inaccurate labels and optimize therapy. These initiatives address gaps in over-diagnosis, promoting evidence-based prescribing amid rising resistance concerns.

Non-Antibiotic Drug Allergens

Non-antibiotic drug allergens encompass a range of pharmaceutical agents, excluding antimicrobial medications, that trigger hypersensitivity reactions through immune-mediated or non-immune mechanisms. These reactions can manifest as immediate IgE-mediated responses, such as anaphylaxis, or delayed T-cell mediated effects, including severe cutaneous adverse reactions. Common classes include nonsteroidal anti-inflammatory drugs (NSAIDs), local anesthetics, iodinated contrast media, anticonvulsants, and biological therapies, which are widely used for pain management, anesthesia, imaging, seizure control, and targeted treatments, respectively. Hypersensitivity to these agents affects a notable subset of patients, often requiring diagnostic confirmation via skin testing or challenge protocols to distinguish true allergies from intolerances. Nonsteroidal anti-inflammatory drugs (NSAIDs), such as aspirin and ibuprofen, are among the most frequent culprits, primarily inducing pseudo-allergic reactions via inhibition, which leads to overproduction of and activation. In patients with (AERD), characterized by , chronic with nasal polyps, and NSAID intolerance, affects approximately 7-10% of adults with . Additionally, NSAID is reported in up to 20-30% of individuals with chronic urticaria, often presenting as acute urticaria or shortly after exposure. Management may involve avoidance, modifiers, or aspirin desensitization protocols to enable safe use in AERD patients. Local anesthetics, exemplified by lidocaine and esters like procaine, rarely cause true IgE-mediated allergies, with most reported reactions attributed to vasovagal responses, methylparaben preservatives, or epinephrine additives rather than the anesthetic itself. True hypersensitivity, confirmed by positive skin prick or intradermal tests, occurs in fewer than 1% of cases, underscoring the importance of allergy evaluation before labeling patients as allergic. Intravenous iodinated contrast media, used in radiographic imaging, provoke anaphylactoid reactions in 1-3% of administrations, more commonly in atopic individuals with a history of asthma or prior reactions; these non-IgE-mediated events involve direct mast cell degranulation and carry a higher risk in atopics, with severe anaphylaxis in 0.04-0.7%. Premedication with corticosteroids and antihistamines is often employed for high-risk patients. Anticonvulsants like are associated with severe delayed reactions, including Stevens-Johnson syndrome (SJS) and (TEN), with an elevated risk linked to the HLA-B*15:02 allele, particularly in Asian populations where the allele prevalence is 5-10%. These life-threatening mucocutaneous disorders occur in 1-6 per 10,000 exposures to , often within 1-8 weeks of initiation, and require immediate drug discontinuation and supportive care. Biological agents, such as monoclonal antibodies (e.g., rituximab, ), can elicit infusion-related reactions ranging from mild chills and fever to true IgE-mediated in 0.5-3% of administrations, driven by anti-drug antibodies or release. Desensitization protocols, involving gradual dose escalation, enable safe re-administration in over 90% of cases for essential therapies. As of 2025, the rise in biologic and use for conditions like cancer and autoimmune diseases has correlated with increased reports of , highlighting the need for enhanced and rapid desensitization strategies. Notably, some non-antibiotic s, such as those in diuretics, show minimal with sulfonamide antibiotics.

Insect and Venom Allergens

Venom Allergens

Venom allergens refer to the protein components in the of stinging , particularly those from the order , which are injected through stings and can trigger IgE-mediated reactions ranging from local swelling to systemic . These allergens are primarily phospholipases, hyaluronidases, and 5 proteins that facilitate venom spread and toxicity while serving as major immunogens. Key venom allergens include Api m 1, a from honeybee (Apis mellifera) venom that constitutes up to 12% of the total venom protein and is recognized by IgE in over 70% of sensitized individuals; Ves v 5, an 5 from yellow jacket ( species) venom that acts as a marker for genuine sensitization and elicits IgE responses in 80-90% of allergic patients; and Pol d 5, a homologous 5 from paper wasp () venom, which shares cross-reactivity with Ves v 5 but is crucial for species-specific diagnosis. Fire ant (Solenopsis invicta) venom contains distinct allergens such as Sol i 1 through Sol i 4, which are small peptides and proteins responsible for the venom's hemolytic and allergenic effects, often leading to reactions from multiple stings due to the ants' aggressive swarming behavior. Severe allergic reactions to these venoms affect approximately 0.5-3% of the , with systemic occurring in about 3% of those stung over a lifetime, manifesting as large local swelling (beyond 10 cm, lasting over 24 hours) or life-threatening symptoms like , , and urticaria. In the United States, stings contribute to approximately 70 deaths annually from (as of 2021), a figure that remains significant without prompt intervention. Venom (VIT), involving of increasing doses of extracts, is the standard treatment for preventing recurrent , demonstrating long-term of 80-90% in protecting against severe reactions upon re-sting, particularly for vespid s where success rates exceed 90%. For honeybee , is slightly lower at 77-84% due to factors like higher baseline potency, but VIT remains highly effective overall when tailored to component-resolved diagnostics.

Other Insect Allergens

Other insect allergens primarily consist of proteins from insect body parts, such as exoskeletons, , , and shed skins, as well as secretions like and , which can trigger IgE-mediated through inhalation of airborne particles or direct skin contact. These allergens differ from venom components by involving chronic environmental or occupational exposure rather than acute injection during stings, often leading to in cases of respiratory symptoms. Cockroach allergens, notably Bla g 1 and Bla g 2 from Blattella germanica and Periplaneta americana species, are potent urban asthma triggers, with fecal residues and body fragments aerosolizing in infested homes. In urban settings, particularly low-income areas, exposure correlates with asthma prevalence, as sensitized children show up to 25% rates in regions like Poland and New York City blocks with high infestation. Storage mites, including Acarus siro and Lepidoglyphus destructor, proliferate in stored grains, flour, and hay, posing risks to food handlers and agricultural workers through inhalant exposure. Sensitization prevalence reaches approximately 10% in Northern European general populations and is elevated among grain elevator operators, where mites infest 73% of samples, causing occupational asthma and rhinitis. Occupational exposure to bee products affects beekeepers handling and , where major royal jelly proteins (MRJPs) like MRJP1 act as key allergens, inducing and respiratory issues. prevalence among beekeepers stands at about 17%, often linked to prolonged contact with these secretions, though systemic reactions remain less common than allergies. Chironomid midges (Chironomus thummi-thummi), whose larvae serve as or aquarium fish food, release tropomyosin allergens during processing, sensitizing up to 20% of exposed individuals like fishermen and aquarists, primarily through respiratory routes. These allergens commonly elicit respiratory reactions, including exacerbations and from , alongside contact urticaria and upon skin exposure. with arises from conserved structures shared across arthropods, explaining why patients sensitized to , storage mites, or chironomids may react to crustaceans like . Climate-driven migration is expanding ranges, potentially heightening allergen exposure in novel areas as warmer temperatures facilitate like and midges to invade previously temperate zones.

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