title: Studies of variola virus and immunity in smallpox. I. Variola virus hemagglutinins.
mesh_terms: D000818:Animals; D000906:Antibodies / Q000032:analysis*; D002498:Centrifugation; D002499:Centrifugation, Density Gradient; D002642:Chick Embryo; D002845:Chromatography; D046508:Culture Techniques; D003588:Cytopathogenic Effect, Viral; D004285:Dogs; D000882:Haplorhini; D006367:HeLa Cells; D006386:Hemagglutination Tests; D007668:Kidney; D012899:Smallpox / Q000276:immunology; D012901:Variola virus / Q000276:immunology*
chemical_list: D000906:Antibodies