The term has been used a lot since the pandemic began.
as “a situation in which a sufficient proportion of a population is immune to an infectious disease to make its spread from person to person unlikely.”
In other words, where herd immunity exists—when lots of people in an area are vaccinated or have already been infected with a disease—fewer people get sick, and fewer germs are able to spread from person to person. The CDC adds that even people who are not vaccinated, like newborn babies and individuals with chronic illnesses, have some level of protection because the disease can’t spread within the community. The theory behind herd immunity is that when someone gets vaccinated, it’s not only that person who is protected from infection—they can’t transmit the disease to other people.
An example of herd immunity via vaccination is the measles outbreak among preschool-age children in the US in the late 1980s. The attack rate decreased faster than coverage increased, and who examined the association between incidence of measles and immunization coverage among preschool-age children concluded that immunization coverage of about 80% may be enough to stop sustained measles outbreaks in an urban community.yet. So the herd immunity situation is a little different. The only option is recovery, which means letting the majority of people catch the virus at some point.
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