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Herd immunity is an important concept of epidemic theory regarding the population-level effect of individual immunity to prevent transmission of pathogens. Herd immunity exists when sufficient numbers of animals in a group or population have immunity against an agent such that the likelihood of an e …
Feb 18, 2021 · It looks like it will take higher vaccination rates to achieve herd immunity against the more infectious strain of SIMVID-19. This is a real concern with emerging variants of the coronavirus ...
Jul 13, 2020 · Second, herd immunity by acquired infection only takes hold if a sufficient proportion of the population actually contracts the disease. This is not a forgone conclusion, ...
Sep 9, 2020 · Herd immunity is a key concept for epidemic control. It states that only a proportion of a population needs to be immune (through overcoming natural infection or through vaccination) to an ...
Jun 1, 2024 · Herd immunity, state in which a large proportion of a population is able to repel an infectious disease, thereby limiting the extent to which the disease can spread from person to person. Herd immunity can be conferred through natural immunity, previous exposure to the disease, or vaccination. An
Jun 30, 2020 · Even if infection with the COVID-19 virus creates long-lasting immunity, a large number of people would have to become infected to reach the herd immunity threshold. Experts estimate that in the U.S., 70% of the population — more than 200 million people — would have to recover from COVID-19 to halt the epidemic.
In simple terms, herd immunity works through achieving a threshold immunity at the population level that is able to theoretically cut the transmission chain of a given infectious disease, be it obtained through natural infection or vaccination. 1 This may not mean that a given individual is fully protected at all times or situations. It is the threshold immunity that, when high enough, can protect most if not all in a population in a given geographical area for a certain time interval.
