Serological evidence of the incidence of influenza equine A-1 virus infections among horses in Hungary.
D000818:Animals; D000917:Antibody Formation; D006385:Hemagglutination Inhibition Tests; D006734:Horse Diseases / Q000209:etiology*; D006736:Horses; D006814:Hungary; D007109:Immunity; D007110:Immunity, Active; D009975:Orthomyxoviridae / Q000302:isolation & purification*; D009976:Orthomyxoviridae Infections / Q000453:epidemiology*