title: HIV and Smallpox.
authors.forename: Rob A
authors.initials: RA
authors.lastname: Gruters
authors.forename: Albert D M E
authors.initials: AD
authors.lastname: Osterhaus
mesh_terms: D000222:Adaptation, Physiological; D006678:HIV / Q000502:physiology*; D015658:HIV Infections / Q000821:virology; D006801:Humans; D012899:Smallpox / Q000821:virology*; D014616:Vaccinia virus / Q000502:physiology*; D012901:Variola virus / Q000502:physiology*