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- 10:04, 18 June 2025 WikiKnight talk contribs created page Herd immunity (Created page with "{{short description|Concept in epidemiology}} {{for|the evolutionary antiparasite defence|Social immunity}} {{Use dmy dates|date=May 2020}} File:Herd immunity.svg|thumb|upright=1.5|The top box shows an outbreak in a community in which a few people are infected (shown in red) and the rest are healthy but unimmunized (shown in blue); the illness spreads freely through the population. The middle box shows a population where a small number have been immunized (shown in yel...")