title: Two-step centrifugation method. A simplification of the density-gradient procedure for the purification of influenza virus.
mesh_terms: D000818:Animals; D001826:Body Fluids; D002499:Centrifugation, Density Gradient; D002642:Chick Embryo; D005321:Extraembryonic Membranes; D006386:Hemagglutination Tests; D006389:Hemagglutinins, Viral / Q000032:analysis; D008722:Methods; D009975:Orthomyxoviridae / Q000254:growth & development / Q000276:immunology / Q000302:isolation & purification*; D013395:Sucrose; D014461:Ultracentrifugation
chemical_list: D006389:Hemagglutinins, Viral; D013395:Sucrose