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Mar 16, 2022 · Herd immunity means that enough people in a group or area have achieved immunity (protection) against a virus or other infectious agent to make it very difficult for the infection to spread. Immunity happens in multiple ways: through natural infection, vaccination or passive transfer.
Nov 4, 2023 · This is called a threshold proportion. If the proportion of the population that is immune to the disease is greater than this threshold, the spread of the disease will decline. This is known as the herd immunity threshold. What percentage of a community needs to be immune in order to achieve herd immunity? It varies from disease to disease.
May 5, 2020 · Herd immunity: the indirect protection from infection conferred to susceptible individuals when a sufficiently large proportion of immune individuals exist in a population. Herd immunity threshold: the point at which the proportion of susceptible individuals in a population falls below the threshold needed for transmission
- Haley E. Randolph, Luis B. Barreiro
- 10.1016/j.immuni.2020.04.012
- 2020
- Immunity. 2020 May 19; 52(5): 737-741.
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.
Apr 16, 2021 · Depending how contagious an infection is, usually 50% to 90% of a population needs immunity before infection rates start to decline. But this percentage isn’t a “magic threshold” that we need to cross—especially for a novel virus.
Dec 31, 2020 · For polio, the threshold is about 80%. The proportion of the population that must be vaccinated against COVID-19 to begin inducing herd immunity is not known. This is an important area of research and will likely vary according to the community, the vaccine, the populations prioritized for vaccination, and other factors.
Apr 12, 2020 · September 13, 2021. By. Gypsyamber D'Souza. , David Dowdy. COVID-19. Epidemiology. Health Security. In the months following the emergence of SARS-CoV-2, “herd immunity” was frequently cited as the long-term destination of the COVID-19 pandemic.
