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Louisa Chapman, MD, MSPH; Diana Wells, MD; Lawrence Schonberger, MD, MPH
Centers for Disease Control Atlanta, Ga

Jeffrey P. Davis, MD
Wisconsin Division of Health Madison Fred Idtse Wisconsin Department of Agriculture, Trade and Consumer Protection Madison

Virginia Hinshaw, PhD; B. C. Easterday, DVM
University of Wisconsin Veterinary Medicine School Madison

JAMA. 1992;267(20):2741.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

To the Editor.

—In 1988, investigation of a fatal case of swine influenza in a previously healthy 32-year-old pregnant woman provided strong evidence for transmission of swine influenza virus infection from ill pigs to humans during a Wisconsin agricultural fair, in which 40% to 60% of exhibited pigs had an influenza-like illness.¹

The results of this investigation led to prospective surveillance for ill pigs at Wisconsin agricultural fairs in 1989 and 1990 to assess the frequency with which visitors to these fairs might be exposed to outbreaks of symptomatic swine influenza. Between May 1976 and June 1977, a serosurvey of pigs from north central states slaughtered at abattoirs in Wisconsin showed that swine influenza virus infections of pigs are common and may have an October-through-December seasonality.²

In 1989, veterinarians responsible for 32 county or state fairs held in the southern two thirds of Wisconsin between July and September . . . [Full Text PDF of this Article]

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