title: Primary vaccination with an attenuated strain of vaccinia virus.
mesh_terms: D000818:Animals; D002642:Chick Embryo; D004673:Encephalomyelitis, Acute Disseminated / Q000517:prevention & control*; D005334:Fever; D006801:Humans; D012900:Smallpox Vaccine / Q000009:adverse effects; D014611:Vaccination; D014616:Vaccinia virus / Q000254:growth & development / Q000472:pathogenicity*; D014774:Virulence; D014776:Virus Cultivation
chemical_list: D012900:Smallpox Vaccine