‘Herd immunity’, also known as ‘population immunity’, is a concept used for vaccination, in which a population can be protected from a certain virus if a threshold of vaccination is reached.
Herd immunity is achieved by protecting people from a virus, not by exposing them to it.
Herd 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. This means that even people who haven’t been infected, or in whom an infection hasn’t triggered an immune response, they are protected because people around them who are immune can act as buffers between them and an infected person. The threshold for establishing herd immunity for COVID-19 is not yet clear.
It is tough to think of a time when science has progressed so quickly!
Also, in the Department of Evolution of Science, the W.H.O.’s January-June 2020 recommendation against masks for the general public:
- NYT curve of South Dakota COVID-19 cases, going up and then down despite no mask or shutdown order being issued (herd immunity without a vaccine or something else?)