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The Centers for Disease Control and Prevention (CDC) have been following H3N2v virus since its first appearance in U.S. pigs in 2010. From July – December 2011, 12 cases of H3N2v infection were detected in the United States of Indiana, Iowa, Maine, Pennsylvania and West Virginia. Since January 2012 to present 308 cases of H3N2v infection across 11 states have been identified. These infections were mostly associated with prolonged exposure to pigs at agricultural fairs. Cases of limited human-to-human spread of this virus has been detected in the Iowa and West Virginia, however sustained community spread of H3N2v has been identified at this time.
The CDC detailed case count report for H3N2v virus can be reviewed by visiting:
Prevention: Information for fairgoers and swine exhibitors:
The CDC has developed video Podcast outlining recommendations for reducing risk of acquiring H3N2v virus for fairgoers and swine exhibitors:
The following research articles have been recently published in the Emerging Infectious Disease Journal. Both of these journal articles studied recent agricultural events and the potential threats to human health and epidemic risks.
Wong KK, Greenbaum A, Moll ME, Lando J, Moore EL, Ganatra R, et al. (2012). Outbreak of influenza A (H3N2) variant virus infection among attendees of an agricultural fair, Pennsylvania, USA, 2011. Emerg Infect Dis, 8:(12), 1937-1944. Retrieved from http://wwwnc.cdc.gov/eid/article/18/12/pdfs/12-1097.pdf
Bowman AS, Nolting JM, Nelson SW, Slemons RD. (2012). Subclinical influenza virus A infections in pigs exhibited at agricultural fairs, Ohio, USA, 2009–2011. Emerg Infect Dis [Internet]. 18:(12), 1945-1950. Retrieved from http://wwwnc.cdc.gov/eid/article/18/12/pdfs/12-1116.pdf
Source: Centers for Disease Control and Prevention.