Individual swine nasal samples from 102 agricultural exhibitions were tested for five respiratory viruses by real-time reverse transcription polymerase chain reaction. The number of individual pigs positive for each pathogen are shown. Seven hundred eighty-five pigs tested positive for at least one pathogen. Of those, 165 pigs tested positive for > 1 pathogen.
IAV: influenza A virus, PPIV1: porcine parainfluenza virus 1, PHEV: porcine hemagglutinating encephalomyelitis, PRRSv: porcine reproductive and respiratory syndrome virus, IDV: influenza D virus.