title: Precipitation in gel test in diagnosis of smallpox.
mesh_terms: D006385:Hemagglutination Inhibition Tests; D006801:Humans; D005779:Immunodiffusion; D012899:Smallpox / Q000175:diagnosis* / Q000276:immunology; D012900:Smallpox Vaccine; D013997:Time Factors; D014611:Vaccination
chemical_list: D012900:Smallpox Vaccine