THE 2002 INTRODUCTION OF WEST NILE VIRUS INTO HARRIS COUNTY, TEXAS, AN AREA HISTORICALLY ENDEMIC FOR ST. LOUIS ENCEPHALITIS

KRISTY M. LILLIBRIDGE Center for Infectious Diseases, School of Public Health, University of Texas Health Science Center, Houston, Texas; Mosquito Control Division, Harris County Public Health and Environmental Services, Houston, Texas; Department of Pathology and Center for Biodefense and Emerging Infectious Diseases, University of Texas Medical Branch, Galveston, Texas

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RAY PARSONS Center for Infectious Diseases, School of Public Health, University of Texas Health Science Center, Houston, Texas; Mosquito Control Division, Harris County Public Health and Environmental Services, Houston, Texas; Department of Pathology and Center for Biodefense and Emerging Infectious Diseases, University of Texas Medical Branch, Galveston, Texas

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YVONNE RANDLE Center for Infectious Diseases, School of Public Health, University of Texas Health Science Center, Houston, Texas; Mosquito Control Division, Harris County Public Health and Environmental Services, Houston, Texas; Department of Pathology and Center for Biodefense and Emerging Infectious Diseases, University of Texas Medical Branch, Galveston, Texas

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AMELIA P. A. TRAVASSOS DA ROSA Center for Infectious Diseases, School of Public Health, University of Texas Health Science Center, Houston, Texas; Mosquito Control Division, Harris County Public Health and Environmental Services, Houston, Texas; Department of Pathology and Center for Biodefense and Emerging Infectious Diseases, University of Texas Medical Branch, Galveston, Texas

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HILDA GUZMAN Center for Infectious Diseases, School of Public Health, University of Texas Health Science Center, Houston, Texas; Mosquito Control Division, Harris County Public Health and Environmental Services, Houston, Texas; Department of Pathology and Center for Biodefense and Emerging Infectious Diseases, University of Texas Medical Branch, Galveston, Texas

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MARINA SIIRIN Center for Infectious Diseases, School of Public Health, University of Texas Health Science Center, Houston, Texas; Mosquito Control Division, Harris County Public Health and Environmental Services, Houston, Texas; Department of Pathology and Center for Biodefense and Emerging Infectious Diseases, University of Texas Medical Branch, Galveston, Texas

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TAWEESAK WUITHIRANYAGOOL Center for Infectious Diseases, School of Public Health, University of Texas Health Science Center, Houston, Texas; Mosquito Control Division, Harris County Public Health and Environmental Services, Houston, Texas; Department of Pathology and Center for Biodefense and Emerging Infectious Diseases, University of Texas Medical Branch, Galveston, Texas

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CHRISTINA HAILEY Center for Infectious Diseases, School of Public Health, University of Texas Health Science Center, Houston, Texas; Mosquito Control Division, Harris County Public Health and Environmental Services, Houston, Texas; Department of Pathology and Center for Biodefense and Emerging Infectious Diseases, University of Texas Medical Branch, Galveston, Texas

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STEPHEN HIGGS Center for Infectious Diseases, School of Public Health, University of Texas Health Science Center, Houston, Texas; Mosquito Control Division, Harris County Public Health and Environmental Services, Houston, Texas; Department of Pathology and Center for Biodefense and Emerging Infectious Diseases, University of Texas Medical Branch, Galveston, Texas

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ADIL A. BALA Center for Infectious Diseases, School of Public Health, University of Texas Health Science Center, Houston, Texas; Mosquito Control Division, Harris County Public Health and Environmental Services, Houston, Texas; Department of Pathology and Center for Biodefense and Emerging Infectious Diseases, University of Texas Medical Branch, Galveston, Texas

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RHIA PASCUA Center for Infectious Diseases, School of Public Health, University of Texas Health Science Center, Houston, Texas; Mosquito Control Division, Harris County Public Health and Environmental Services, Houston, Texas; Department of Pathology and Center for Biodefense and Emerging Infectious Diseases, University of Texas Medical Branch, Galveston, Texas

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TAMRA MEYER Center for Infectious Diseases, School of Public Health, University of Texas Health Science Center, Houston, Texas; Mosquito Control Division, Harris County Public Health and Environmental Services, Houston, Texas; Department of Pathology and Center for Biodefense and Emerging Infectious Diseases, University of Texas Medical Branch, Galveston, Texas

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DANA L. VANLANDINGHAM Center for Infectious Diseases, School of Public Health, University of Texas Health Science Center, Houston, Texas; Mosquito Control Division, Harris County Public Health and Environmental Services, Houston, Texas; Department of Pathology and Center for Biodefense and Emerging Infectious Diseases, University of Texas Medical Branch, Galveston, Texas

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ROBERT B. TESH Center for Infectious Diseases, School of Public Health, University of Texas Health Science Center, Houston, Texas; Mosquito Control Division, Harris County Public Health and Environmental Services, Houston, Texas; Department of Pathology and Center for Biodefense and Emerging Infectious Diseases, University of Texas Medical Branch, Galveston, Texas

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Harris County, Texas, is an endemic area of St. Louis encephalitis (SLE); and an active surveillance program that monitors SLE virus activity in mosquitoes, birds, and humans has been in place there for the past 28 years. In June of 2002, West Nile (WN) virus appeared in Houston and quickly spread throughout the region. This report describes the results of 12 years of SLE surveillance in Harris County and the contrasting pattern of WN virus activity, when it arrived in 2002. Our data indicate that both SLE and WN viruses can coexist, despite their ecologic, antigenic, and genetic similarities, and that both viruses will probably persist in this geographic region.

Author Notes

Reprint requests: Robert B. Tesh, Department of Pathology, University of Texas Medical Branch, 301 University Boulevard, Galveston, TX 77555-0609, Telephone: 409-747-2431, Fax: 409-747-2429, E-mail: rtesh@utmb.edu.
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