title: Recombinant vaccinia viruses as vaccines.
abstract: The prospect of live vaccines consisting of genetically modified vaccinia virus expressing foreign genes is exciting, but important issues concerning safety and efficacy need to be resolved.
mesh_terms: D000818:Animals; D002417:Cattle; D004279:DNA, Viral / Q000235:genetics; D005814:Genes, Viral; D006801:Humans; D014612:Vaccines; D014616:Vaccinia virus / Q000235:genetics / Q000276:immunology*
chemical_list: D004279:DNA, Viral; D014612:Vaccines