WHO changes the definition of “Herd Immunity”

The WHO starts steering the definition of ‘herd immunity’ to be attributed ONLY to vaccinated populations and removing the [known] reference to immunity gained from natural infection of a pathogen.  The WHO web page first archived  this change on October 15, 2020. [2]

Then by December 31, 2020 the WHO updates the herd immunity definition to again include “natural infection“.

They also removed the reference to antibodies.  This is important as binding antibodies vs neutralising makes a big difference, especially for coronavirus vaccines, where immune enhancement has been an issue in previous animal studies.

Herd immunity is a known concept associated of disease spread in a population, such that if one person has the infection, they spread it to one or less other people, as Professor Bhattacharya explains.

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