title: Epidemiological and virological studies on the off-season smallpox cases in Calcutta.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D004196:Disease Outbreaks; D005260:Female; D006801:Humans; D007194:India; D008297:Male; D012621:Seasons; D012899:Smallpox / Q000453:epidemiology*