Acute outbreaks of respiratory disease in swine at agricultural fairs in Michigan, USA, in 2015 raised concern for potential human exposure to influenza A virus. Testing ruled out influenza A virus and identified porcine hemagglutinating encephalomyelitis virus as the cause of influenza-like illness in the affected swine.
Keywords: Indiana; Michigan; Ohio; United States; coronavirus; differential diagnosis; disease outbreaks; exhibition swine; influenza A virus; porcine hemagglutinating encephalomyelitis; porcine hemagglutinating encephalomyelitis virus; respiratory infections; swine; viruses.