TY - JOUR AU - Bowman, Andrew AU - Nolting, Jacqueline AU - Nelson, Sarah AU - Slemons, Richard T1 - Subclinical Influenza Virus A Infections in Pigs Exhibited at Agricultural Fairs, Ohio, USA, 2009–2011 T2 - Emerging Infectious Disease journal PY - 2012 VL - 18 IS - 12 SP - 1945 SN - 1080-6059 AB - Agricultural fairs are associated with bidirectional, interspecies transmission of influenza virus A between humans and pigs. We examined pigs exhibited at agricultural fairs in Ohio during 2009–2011 for signs of influenza-like illness and collected nasal swab specimens from a representative subset of these animals. Influenza virus A was recovered from pigs at 12/53 (22.6%) fairs during the 3-year sampling period. Pigs at 10/12 (83.3%) fairs from which influenza virus A was recovered did not show signs of influenza-like illness. Hemagglutinin, neuraminidase, and matrix gene combinations of the isolates were consistent with influenza virus A concurrently circulating among swine herds in the United States. Subclinical influenza virus A infections in pigs at agricultural fairs may pose a risk to human health and create challenges for passive surveillance programs for influenza virus A in swine herds. KW - Influenza virus A KW - swine KW - subclinical KW - infection KW - livestock KW - exhibits KW - viruses KW - influenza KW - Ohio KW - United States KW - agriculture KW - human KW - zoonoses KW - pigs DO - 10.3201/eid1812.121116 UR - https://wwwnc.cdc.gov/eid/article/18/12/12-1116_article ER - End of Reference