Abstract
Within 5 months after the earliest detection of human influenza A(H1N1)pdm09 virus, we found molecular and culture evidence of the virus in healthy US show pigs. The mixing of humans and pigs at swine shows possibly could further the geographic and cross-species spread of influenza A viruses.
Highlights
Cross-species infections with influenza A viruses readily occur between humans and pigs
We found a 19% prevalence of influenza A virus among the 57 show pigs swabbed at the 2009 Minnesota state fair, which occurred during the second wave of the 2009 pandemic
Temporal analysis of the results indicated that most pigs with rRT-PCR–positive results were sampled
Summary
Cross-species infections with influenza A viruses readily occur between humans and pigs. >7 years of age showing pigs at 3 state fairs in Minnesota (2008, 2009) and South Dakota (2009). Nasal swab specimens were collected from a total of 149 pigs (from Minnesota, 47 in 2008 and 57 in 2009; from South Dakota, 45 in 2009).
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