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Simultaneous Infection of Pigs and People with Triple-Reassortant Swine Influenza Virus H1N1 at a U.S. County Fair


  • Work with the swine specimens was conducted at the National Veterinary Services Laboratories, Ames, IA, and work with human specimens was conducted at the Centers for Disease Control and Prevention, Atlanta, GA, USA.

S. L. Swenson. National Veterinary Services Laboratories, PO Box 844, 1920 Dayton Avenue, Ames, IA 50010, USA. Tel.: (515) 337 7551; Fax: (515) 337 7348; E-mail:


Influenza-like illness was noted in people and pigs in attendance at an Ohio county fair in August 2007. The morbidity rate in swine approached 100% within 1–2 days of initial clinical signs being recognized, and approximately two dozen people developed influenza-like illness. Triple-reassortant swine H1N1 influenza viruses were identified in both pigs and people at the fair. The identified viruses (A/Sw/OH/511445/2007, A/Ohio/01/2007, and A/Ohio/02/2007) were similar to H1N1 swine influenza viruses currently found in the U.S. swine population. This case illustrates the possibility of transmission of swine influenza in settings where there is close human/swine interaction.