title: Highly pathogenic avian influenza spreads in the USA.
mesh_terms: D000818:Animals; D000835:Animals, Wild; D001717:Birds; D004196:Disease Outbreaks / Q000662:veterinary*; D053124:Influenza A Virus, H5N1 Subtype / Q000472:pathogenicity; D053125:Influenza A Virus, H5N2 Subtype / Q000472:pathogenicity; D009980:Influenza A virus / Q000472:pathogenicity*; D005585:Influenza in Birds / Q000453:epidemiology* / Q000821:virology; D011159:Population Surveillance; D011200:Poultry; D014481:United States / Q000453:epidemiology