title: Isolation of influenza virus A/USSR 90/77 (H1N1) from wild birds.
mesh_terms: D000818:Animals; D001717:Birds / Q000382:microbiology*; D004199:Disease Vectors; D053118:Influenza A Virus, H1N1 Subtype; D009980:Influenza A virus / Q000302:isolation & purification*; D009976:Orthomyxoviridae Infections / Q000635:transmission; D012383:Romania