title: A study of intrafamilial transmission of smallpox.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D004196:Disease Outbreaks; D005260:Female; D006801:Humans; D008297:Male; D010154:Pakistan; D012737:Sex Factors; D012899:Smallpox / Q000453:epidemiology / Q000235:genetics* / Q000276:immunology / Q000401:mortality; D013997:Time Factors; D014611:Vaccination