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Herd immunity (also called herd effect, community immunity, population immunity, or mass immunity) is a form of indirect protection that applies only to contagious diseases.
If the proportion of the population that is immune exceeds the herd immunity level for the disease, then the disease can no longer persist in the population and its transmission dies out. [28] Thus, a disease can be eliminated from a population if enough individuals are immune due to either vaccination or recovery from prior exposure to disease.
Strong herd immunity reduces this vulnerability. Increasing herd immunity during an outbreak or when there is a risk of an outbreak is perhaps the most widely accepted justification for mass vaccination. When a new vaccine is introduced, mass vaccination can help increase coverage rapidly. [43]
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[1] [2] A 2014 update of the classification guide added a 9th category and added 30 new gene defects from the prior 2009 version. [3] [4] The most recent classification was released in 2019. [5] The number of identified conditions continues to grow over time as more research is done.
The general stages of seroconversion for hepatitis B, where the line of detectability indicates seropositivity. In immunology, seroconversion is the development of specific antibodies in the blood serum as a result of infection or immunization, including vaccination.
In order for the U.S. to achieve herd immunity in 2021, the majority of the population needs to get vaccinated, says Anthony Fauci, MD, the federal government’s top expert on infectious diseases ...
Download as PDF; Printable version; In other projects ... Graph of herd immunity threshold vs basic reproduction number with selected diseases . This page was last ...