title: Studies on the origin of pandemic influenza. IV. Selection and transmission of "new" influenza viruses in vivo.
mesh_terms: D000818:Animals; D000917:Antibody Formation; D000956:Antigens, Viral; D002645:Chickens; D006389:Hemagglutinins, Viral / Q000276:immunology; D007114:Immunization; D007117:Immunization, Secondary; D009980:Influenza A virus / Q000276:immunology; D009439:Neuraminidase / Q000276:immunology; D009975:Orthomyxoviridae / Q000276:immunology; D011995:Recombination, Genetic; D012641:Selection, Genetic; D014422:Turkeys
chemical_list: D000956:Antigens, Viral; D006389:Hemagglutinins, Viral; D009439:Neuraminidase