Hepatitis A--investigation and control of outbreaks in two primary schools.
D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D004196:Disease Outbreaks / Q000453:epidemiology*; D004739:England; D005260:Female; D006506:Hepatitis A / Q000453:epidemiology* / Q000635:transmission; D006801:Humans; D006920:Hygiene; D008297:Male; D012574:Schools; D014038:Toilet Facilities