Herd immunity to infections.
D000293:Adolescent; D000328:Adult; D002648:Child; D003140:Communicable Disease Control; D003141:Communicable Diseases / Q000453:epidemiology / Q000276:immunology*; D005260:Female; D006801:Humans; D007113:Immunity, Innate; D008297:Male; D012606:Scotland