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Breakthrough infection
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Breakthrough infection
A breakthrough infection is a case of illness in which a vaccinated individual becomes infected with the illness, because the vaccine has failed to provide complete immunity against the pathogen (currently only viruses). Breakthrough infections have been identified in individuals immunized against a variety of diseases including mumps, varicella (Chickenpox), influenza, and COVID-19. The characteristics of the breakthrough infection are dependent on the virus itself. Often, infection of the vaccinated individual results in milder symptoms and shorter duration than if the infection were contracted naturally.
Causes of breakthrough infections include biological factors in the recipient, improper administration or storage of vaccines, mutations in viruses, blocking antibody formation, and other factors. For these reasons, vaccines are rarely 100% effective. A 2021 study found the common flu vaccine provided immunity to the flu in 58% of recipients. The measles vaccine fails to provide immunity to 2% of children that receive the vaccine. However, if herd immunity exists, it typically prevents individuals who are ineffectively vaccinated from contracting the disease. Accordingly, herd immunity reduces the number of breakthrough infections in a population.
The varicella vaccine is 85% effective at preventing varicella (chickenpox) infection. However, 75% of individuals that are diagnosed with breakthrough varicella exhibit milder symptoms than individuals that are not vaccinated. These individuals with mild varicella have low fevers, fewer than 50 lesions on their skin, and a maculopapular rash. In contrast, unvaccinated individuals typically have a fever of 102, 200-500 skin lesions, and macules (lesions that are not elevated) evolve to papules and vesicular lesions. Additionally, infection in unvaccinated individuals tends to last for a longer period of time than in individuals who have been vaccinated.
The majority of cases of breakthrough varicella are attributed to the failure of an individual to uptake[clarification needed] the varicella vaccine. Therefore, to prevent breakthrough infections, it is proposed that children receive a second dose of varicella vaccine less than a year after getting their first dose.
The mumps vaccine is a component of the Measles, Mumps and Rubella vaccine (MMR). The mumps vaccine, specifically, is 88% effective at preventing mumps. Individuals with breakthrough cases of mumps have fewer serious complications from the infections as compared to individuals unvaccinated for mumps. These complications include the development of aseptic meningitis and encephalitis.
The cause of breakthrough mumps is not currently completely understood. Evolution of the virus (antigenic drift) is thought to explain the majority of breakthrough cases. Other theories suggest that memory T lymphocytes play a role in the development of breakthrough infections.
Breakthrough cases of Hepatitis B are primarily attributed to mutations in the Hepatitis B virus (HBV) that make HBV surface proteins unrecognizable to antibodies produced from the HBV vaccine. Viruses with such mutations are called "vaccine escape mutants". Breakthrough infections may also be caused by delayed vaccination, immunosuppression, and maternal viral load. It is possible for an individual to have breakthrough infection of HBV but be asymptomatic.
In April 2021, scientists reported that in a cohort of 417 vaccinated persons, two women had breakthrough infections as of publication and identified their variants' viral mutations. In the same month, the CDC reported that in the United States, there were 5,814 COVID-19 breakthrough infections and 74 deaths among the more than 75 million people fully vaccinated for the COVID-19 virus. In July 2021, scientists reported that in an outbreak of the SARS-CoV-2 Delta variant, associated with large public gatherings, 74% of infections occurred in fully vaccinated people.
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Breakthrough infection
A breakthrough infection is a case of illness in which a vaccinated individual becomes infected with the illness, because the vaccine has failed to provide complete immunity against the pathogen (currently only viruses). Breakthrough infections have been identified in individuals immunized against a variety of diseases including mumps, varicella (Chickenpox), influenza, and COVID-19. The characteristics of the breakthrough infection are dependent on the virus itself. Often, infection of the vaccinated individual results in milder symptoms and shorter duration than if the infection were contracted naturally.
Causes of breakthrough infections include biological factors in the recipient, improper administration or storage of vaccines, mutations in viruses, blocking antibody formation, and other factors. For these reasons, vaccines are rarely 100% effective. A 2021 study found the common flu vaccine provided immunity to the flu in 58% of recipients. The measles vaccine fails to provide immunity to 2% of children that receive the vaccine. However, if herd immunity exists, it typically prevents individuals who are ineffectively vaccinated from contracting the disease. Accordingly, herd immunity reduces the number of breakthrough infections in a population.
The varicella vaccine is 85% effective at preventing varicella (chickenpox) infection. However, 75% of individuals that are diagnosed with breakthrough varicella exhibit milder symptoms than individuals that are not vaccinated. These individuals with mild varicella have low fevers, fewer than 50 lesions on their skin, and a maculopapular rash. In contrast, unvaccinated individuals typically have a fever of 102, 200-500 skin lesions, and macules (lesions that are not elevated) evolve to papules and vesicular lesions. Additionally, infection in unvaccinated individuals tends to last for a longer period of time than in individuals who have been vaccinated.
The majority of cases of breakthrough varicella are attributed to the failure of an individual to uptake[clarification needed] the varicella vaccine. Therefore, to prevent breakthrough infections, it is proposed that children receive a second dose of varicella vaccine less than a year after getting their first dose.
The mumps vaccine is a component of the Measles, Mumps and Rubella vaccine (MMR). The mumps vaccine, specifically, is 88% effective at preventing mumps. Individuals with breakthrough cases of mumps have fewer serious complications from the infections as compared to individuals unvaccinated for mumps. These complications include the development of aseptic meningitis and encephalitis.
The cause of breakthrough mumps is not currently completely understood. Evolution of the virus (antigenic drift) is thought to explain the majority of breakthrough cases. Other theories suggest that memory T lymphocytes play a role in the development of breakthrough infections.
Breakthrough cases of Hepatitis B are primarily attributed to mutations in the Hepatitis B virus (HBV) that make HBV surface proteins unrecognizable to antibodies produced from the HBV vaccine. Viruses with such mutations are called "vaccine escape mutants". Breakthrough infections may also be caused by delayed vaccination, immunosuppression, and maternal viral load. It is possible for an individual to have breakthrough infection of HBV but be asymptomatic.
In April 2021, scientists reported that in a cohort of 417 vaccinated persons, two women had breakthrough infections as of publication and identified their variants' viral mutations. In the same month, the CDC reported that in the United States, there were 5,814 COVID-19 breakthrough infections and 74 deaths among the more than 75 million people fully vaccinated for the COVID-19 virus. In July 2021, scientists reported that in an outbreak of the SARS-CoV-2 Delta variant, associated with large public gatherings, 74% of infections occurred in fully vaccinated people.