title: Study of 1918 influenza pandemic virus provides information on origin and virulence mechanisms.
mesh_terms: D000818:Animals; D001980:Bronchi / Q000821:virology; D002460:Cell Line; D002642:Chick Embryo / Q000821:virology; D004196:Disease Outbreaks; D005260:Female; D005814:Genes, Viral; D005821:Genetic Techniques; D019267:Hemagglutinin Glycoproteins, Influenza Virus / Q000235:genetics / Q000378:metabolism; D049673:History, 20th Century; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype / Q000235:genetics* / Q000472:pathogenicity* / Q000502:physiology; D007251:Influenza, Human / Q000453:epidemiology / Q000266:history / Q000821:virology*; D008168:Lung / Q000473:pathology / Q000821:virology; D051379:Mice; D008807:Mice, Inbred BALB C; D009439:Neuraminidase / Q000235:genetics / Q000378:metabolism; D009976:Orthomyxoviridae Infections / Q000473:pathology / Q000821:virology*; D012367:RNA, Viral / Q000235:genetics; D011995:Recombination, Genetic; D020545:Respiratory Mucosa / Q000821:virology; D014357:Trypsin / Q000378:metabolism; D010948:Viral Plaque Assay; D014774:Virulence / Q000235:genetics*; D014779:Virus Replication
chemical_list: D019267:Hemagglutinin Glycoproteins, Influenza Virus; D012367:RNA, Viral; D009439:Neuraminidase; D014357:Trypsin