Serologic evidence of human infection with swine influenza virus.
D000328:Adult; D000818:Animals; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D007087:Illinois; D007251:Influenza, Human / Q000453:epidemiology / Q000276:immunology*; D009784:Occupational Diseases / Q000453:epidemiology / Q000276:immunology; D009975:Orthomyxoviridae; D013552:Swine; D013553:Swine Diseases / Q000453:epidemiology / Q000276:immunology*; D015047:Zoonoses / Q000276:immunology*