SEROLOGICAL EVIDENCE OF WEST NILE VIRUS ACTIVITY IN EL SALVADOR

LILIAN CRUZ Field Epidemiology Training Program, Ministry of Public Health and Social Welfare, San Salvador, El Salvador; University of Texas–Houston School of Public Health, El Paso Regional Campus, El Paso, Texas; University of Texas Medical Branch, Center for Biodefense and Emerging Infectious Diseases, and Department of Pathology, Galveston, Texas; Centers for Disease Control and Prevention, Division of Vector Borne Infectious Diseases, Fort Collins, Colorado; Centers for Disease Control and Prevention, Division of International Health, Atlanta, Georgia

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VICTOR M. CARDENAS Field Epidemiology Training Program, Ministry of Public Health and Social Welfare, San Salvador, El Salvador; University of Texas–Houston School of Public Health, El Paso Regional Campus, El Paso, Texas; University of Texas Medical Branch, Center for Biodefense and Emerging Infectious Diseases, and Department of Pathology, Galveston, Texas; Centers for Disease Control and Prevention, Division of Vector Borne Infectious Diseases, Fort Collins, Colorado; Centers for Disease Control and Prevention, Division of International Health, Atlanta, Georgia

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MAURICIO ABARCA Field Epidemiology Training Program, Ministry of Public Health and Social Welfare, San Salvador, El Salvador; University of Texas–Houston School of Public Health, El Paso Regional Campus, El Paso, Texas; University of Texas Medical Branch, Center for Biodefense and Emerging Infectious Diseases, and Department of Pathology, Galveston, Texas; Centers for Disease Control and Prevention, Division of Vector Borne Infectious Diseases, Fort Collins, Colorado; Centers for Disease Control and Prevention, Division of International Health, Atlanta, Georgia

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TITO RODRIGUEZ Field Epidemiology Training Program, Ministry of Public Health and Social Welfare, San Salvador, El Salvador; University of Texas–Houston School of Public Health, El Paso Regional Campus, El Paso, Texas; University of Texas Medical Branch, Center for Biodefense and Emerging Infectious Diseases, and Department of Pathology, Galveston, Texas; Centers for Disease Control and Prevention, Division of Vector Borne Infectious Diseases, Fort Collins, Colorado; Centers for Disease Control and Prevention, Division of International Health, Atlanta, Georgia

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ROBERTO FLORES REYNA Field Epidemiology Training Program, Ministry of Public Health and Social Welfare, San Salvador, El Salvador; University of Texas–Houston School of Public Health, El Paso Regional Campus, El Paso, Texas; University of Texas Medical Branch, Center for Biodefense and Emerging Infectious Diseases, and Department of Pathology, Galveston, Texas; Centers for Disease Control and Prevention, Division of Vector Borne Infectious Diseases, Fort Collins, Colorado; Centers for Disease Control and Prevention, Division of International Health, Atlanta, Georgia

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MARIO V. SERPAS Field Epidemiology Training Program, Ministry of Public Health and Social Welfare, San Salvador, El Salvador; University of Texas–Houston School of Public Health, El Paso Regional Campus, El Paso, Texas; University of Texas Medical Branch, Center for Biodefense and Emerging Infectious Diseases, and Department of Pathology, Galveston, Texas; Centers for Disease Control and Prevention, Division of Vector Borne Infectious Diseases, Fort Collins, Colorado; Centers for Disease Control and Prevention, Division of International Health, Atlanta, Georgia

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ROBERT E. FONTAINE Field Epidemiology Training Program, Ministry of Public Health and Social Welfare, San Salvador, El Salvador; University of Texas–Houston School of Public Health, El Paso Regional Campus, El Paso, Texas; University of Texas Medical Branch, Center for Biodefense and Emerging Infectious Diseases, and Department of Pathology, Galveston, Texas; Centers for Disease Control and Prevention, Division of Vector Borne Infectious Diseases, Fort Collins, Colorado; Centers for Disease Control and Prevention, Division of International Health, Atlanta, Georgia

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DAVID W. C. BEASLEY Field Epidemiology Training Program, Ministry of Public Health and Social Welfare, San Salvador, El Salvador; University of Texas–Houston School of Public Health, El Paso Regional Campus, El Paso, Texas; University of Texas Medical Branch, Center for Biodefense and Emerging Infectious Diseases, and Department of Pathology, Galveston, Texas; Centers for Disease Control and Prevention, Division of Vector Borne Infectious Diseases, Fort Collins, Colorado; Centers for Disease Control and Prevention, Division of International Health, Atlanta, Georgia

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AMELIA P. A. TRAVASSOS DA ROSA Field Epidemiology Training Program, Ministry of Public Health and Social Welfare, San Salvador, El Salvador; University of Texas–Houston School of Public Health, El Paso Regional Campus, El Paso, Texas; University of Texas Medical Branch, Center for Biodefense and Emerging Infectious Diseases, and Department of Pathology, Galveston, Texas; Centers for Disease Control and Prevention, Division of Vector Borne Infectious Diseases, Fort Collins, Colorado; Centers for Disease Control and Prevention, Division of International Health, Atlanta, Georgia

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SCOTT C. WEAVER Field Epidemiology Training Program, Ministry of Public Health and Social Welfare, San Salvador, El Salvador; University of Texas–Houston School of Public Health, El Paso Regional Campus, El Paso, Texas; University of Texas Medical Branch, Center for Biodefense and Emerging Infectious Diseases, and Department of Pathology, Galveston, Texas; Centers for Disease Control and Prevention, Division of Vector Borne Infectious Diseases, Fort Collins, Colorado; Centers for Disease Control and Prevention, Division of International Health, Atlanta, Georgia

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ROBERT B. TESH Field Epidemiology Training Program, Ministry of Public Health and Social Welfare, San Salvador, El Salvador; University of Texas–Houston School of Public Health, El Paso Regional Campus, El Paso, Texas; University of Texas Medical Branch, Center for Biodefense and Emerging Infectious Diseases, and Department of Pathology, Galveston, Texas; Centers for Disease Control and Prevention, Division of Vector Borne Infectious Diseases, Fort Collins, Colorado; Centers for Disease Control and Prevention, Division of International Health, Atlanta, Georgia

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ANN M. POWERS Field Epidemiology Training Program, Ministry of Public Health and Social Welfare, San Salvador, El Salvador; University of Texas–Houston School of Public Health, El Paso Regional Campus, El Paso, Texas; University of Texas Medical Branch, Center for Biodefense and Emerging Infectious Diseases, and Department of Pathology, Galveston, Texas; Centers for Disease Control and Prevention, Division of Vector Borne Infectious Diseases, Fort Collins, Colorado; Centers for Disease Control and Prevention, Division of International Health, Atlanta, Georgia

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GLORIA SUAREZ-RANGEL Field Epidemiology Training Program, Ministry of Public Health and Social Welfare, San Salvador, El Salvador; University of Texas–Houston School of Public Health, El Paso Regional Campus, El Paso, Texas; University of Texas Medical Branch, Center for Biodefense and Emerging Infectious Diseases, and Department of Pathology, Galveston, Texas; Centers for Disease Control and Prevention, Division of Vector Borne Infectious Diseases, Fort Collins, Colorado; Centers for Disease Control and Prevention, Division of International Health, Atlanta, Georgia

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Epizootics of encephalitis in El Salvador killed 203 equines between November 2001 and April 2003. During an investigation of the outbreaks, 18 (25%) of 73 serum samples collected from stablemates of deceased animals in 2003 had antibodies to West Nile virus. Ten of these infections were confirmed by plaque reduction neutralization tests, suggesting West Nile virus has extended its range and spread to Central America.

Author Notes

Reprint requests: Victor M. Cardenas, M.D., M.P.H., Ph.D., El Paso Regional Campus, University of Texas–Houston School of Public Health, 1100 N. Stanton Ave., Suite 110F, El Paso, TX 79902.
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