Herd immunity is when a disease can’t find new people to infect in a community because enough people have become immune.
By incorporating age and social activity level into the epidemiological models, they found that the level of community infection at which herd immunity kicks in changes from about 60% to about 43%, they said in their paper published in Science.
He said the findings have potential consequences “for release of lockdown and suggest that individual variation is an important feature to include in models that guide policy.” compiled at her institution show a decline in some provinces. However, she added: “I want to make the point that we are not out of the woods yet. All South Africans are urged to physically distance, wear masks and wash hands. We need to do this to protect ourselves and others, particularly vulnerable people.
Since then, it has been held up as an example by both the pro- and anti-lockdown lobby groups: infections there have dropped dramatically, but that has come at a huge cost.
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