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SURVEILLANCE RESULTS FROM THE FIRST WEST NILE VIRUS TRANSMISSION SEASON IN FLORIDA, 2001

After West Nile virus (WNV) was first detected in Florida in July 2001, intensive surveillance efforts over the following five months uncovered virus activity in 65 of the state’s 67 counties with 1,106 wild birds, 492 horses, 194 sentinel chickens, and 12 people found infected with the virus. Thirteen of 28 mosquito isolations came from Culex mosquitoes. As seen in the northeastern United States, wild bird mortality was the most sensitive surveillance method. However, unlike the predominantly urban 1999 and 2000 epizootics, the Florida transmission foci were rural with most activity detected in the northern part of the state. All human cases were preceded by the detection of WNV in animals; however, only eight of the twelve cases were preceded by reports of WNV activity in the county of residence. West Nile virus-positive animals detected by multiple surveillance systems preceded seven of these cases by two weeks or more.

Received December 12, 2002. Accepted for publication March 24, 2003.

Acknowledgments: We thank the county health department staff for coordinating local dead bird reporting and WNV testing; the Bureau of Laboratory and Bureau of Animal Disease Diagnostics staff for excellent laboratory support; Tom Loyless, Dr. John Smith, and the Florida Mosquito Control District staff and the CDC for mosquito collections; Gary Sprandel for assistance with the dead bird database; and D’Juan Harris for producing the maps for this manuscript.

Financial support: The study was supported by CDC grant "Epidemiology and Laboratory Capacity for Infectious Diseases," the Florida Department of Health, the Florida Department of Agriculture and Consumer Services, and the Florida Fish and Wildlife Conservation Commission.

Authors’ addresses: Carina G. M. Blackmore, Florida Department of Health, Box 210, Jacksonville FL, 32331, Telephone: 904-791-1744, Fax: 904-791-1567, E-mail: Carina_Blackmore{at}doh.state.fl.us. Lillian M. Stark, Bureau of Laboratories-Tampa, 3602 Spectrum Boulevard, Tampa, FL 33612, Telephone: 813-974-5990, Fax: 813-974-9776. William C. Jeter, Division of Animal Industry, 407 South Calhoun Street, Room 335, Mayo Building, Tallahassee, FL 32399-0800, Telephone: 850-410-0942, Fax: 850-410-0915. Robin L. Oliveri, Lisa A. Conti, and Steven T. Wiersma, Bureau of Epidemiology, 4052 Bald Cypress Way (Bin A-12), Tallahassee, FL 32399-1720, Telephone: 850-245-4401, Fax: 850-922-9299. Robert G. Brooks, Department of Family Medicine and Rural Health, College of Medicine, Florida State University, Tallahassee FL, 32306-4300, Telephone: 850-644-3845, Fax: 850-644-9399.

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