Syllabus Section: Health Issues
Why in News?
In several metros where serosurveys showed high immunity levels, Covid cases are still surging.
Herd immunity’, also known as ‘population immunity’, is the indirect protection from an infectious disease that happens when immunity develops in a population either through vaccination or through previous infection.
- In India,Infection Fatality Rate (IFR).estimate is 0.08%
- Herd immunity does not mean unvaccinated or individuals who have not previously been infected are themselves immune.
- Instead, herd immunity exists when individuals who are not immune, but live in a community with a high proportion of immunity, have a reduced risk of disease as compared to non-immune individuals living in a community with a small proportion of immunity.
- In communities with high immunity, the non-immune people have a lower risk of disease than they otherwise would, but their reduced risk results from the immunity of people in the community in which they are living (i.e., herd immunity) not because they are personally immune.
Source: The Indian Express