Sociological factors in the spread of variola minor in a semi-rural school district.
D000328:Adult; D002648:Child; D004196:Disease Outbreaks; D006801:Humans; D012572:School Health Services; D012899:Smallpox / Q000453:epidemiology* / Q000235:genetics / Q000517:prevention & control; D012959:Socioeconomic Factors; D014611:Vaccination