HERD IMMUNITY

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• What is herd immunity and will it work against the Corona virus:---)Herd immunity (also known as community immunity) can be defined as “a situation in which a sufficient proportion of a population is immune to an infectious disease (through vaccination and/or prior illness) 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 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. Herd immunity protects people who cannot be vaccinated because their immune systems aren’t strong enough and are therefore the most vulnerable to serious illness. 

An example of herd immunity via vaccination is plague in India. The attack rate decreased faster than coverage increased, a researchers 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. Of course, there’s no vaccine for COVID-19 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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