title: Laboratory work on smallpox virus.
mesh_terms: D004739:England; D005260:Female; D006801:Humans; D007757:Laboratory Infection / Q000517:prevention & control; D008131:London; D009787:Occupational Medicine / Q000592:standards; D012449:Safety; D012899:Smallpox / Q000209:etiology*; D012901:Variola virus