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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. It occurs when a sufficient percentage of a population has become immune to an infection, whether through previous infections or vaccination , [1] thereby ...
Herd immunity occurs when a significant portion of a population becomes immune to an infectious disease and the risk of spread from person to person decreases; those who are not immune are indirectly protected because ongoing disease spread is very small.
Apr 24, 2020 · Herd immunity—or community immunity—is based on the idea that as more people develop immunity to a disease, they help prevent the spread to others who are more vulnerable. How Does Herd Immunity Work?
Dec 31, 2020 · What is ‘herd immunity’? 'Herd immunity', also known as 'population immunity', is the indirect protection from an infectious disease that happens when a population is immune either through vaccination or immunity developed through previous infection.
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
Jun 1, 2024 · Herd immunity is important because it defines when a whole community is protected. That includes people who haven't caught the disease, people who had the illness and recovered, and people who got a vaccine. It also includes people who can't get a vaccine.
May 5, 2021 · Since the earliest months of the COVID-19 pandemic, “herd immunity” has become shorthand for the day when enough people are immune to the virus that social distancing can end and healthcare systems are no longer overwhelmed.
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.
Sep 7, 2023 · This is called ‘herd immunity’, 'community immunity' or 'herd protection', and it gives protection to vulnerable people such as newborn babies, elderly people and those who are too sick to be vaccinated. Herd immunity does not protect against all vaccine-preventable diseases.
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.
