Smallpox inquiry blames systems, not individuals.
D003428:Cross Infection / Q000209:etiology; D004196:Disease Outbreaks / Q000453:epidemiology*; D005260:Female; D006801:Humans; D007757:Laboratory Infection / Q000150:complications; D008131:London; D008297:Male; D012899:Smallpox / Q000453:epidemiology*