West Nile Virus Ecology in a Tropical Ecosystem in Guatemala

Maria E. Morales-Betoulle Center for Health Studies, Universidad del Valle de Guatemala, Guatemala; Centers for Disease Control and Prevention, Arbovirus Disease Branch, Fort Collins, Colorado; University of California, Santa Cruz, California; Fundación Mario Dary, Guatemala City, Guatemala; and Fundación para el Ecodesarrollo, Guatemala City, Guatemala

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Nicholas Komar Center for Health Studies, Universidad del Valle de Guatemala, Guatemala; Centers for Disease Control and Prevention, Arbovirus Disease Branch, Fort Collins, Colorado; University of California, Santa Cruz, California; Fundación Mario Dary, Guatemala City, Guatemala; and Fundación para el Ecodesarrollo, Guatemala City, Guatemala

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Nicholas A. Panella Center for Health Studies, Universidad del Valle de Guatemala, Guatemala; Centers for Disease Control and Prevention, Arbovirus Disease Branch, Fort Collins, Colorado; University of California, Santa Cruz, California; Fundación Mario Dary, Guatemala City, Guatemala; and Fundación para el Ecodesarrollo, Guatemala City, Guatemala

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Danilo Alvarez Center for Health Studies, Universidad del Valle de Guatemala, Guatemala; Centers for Disease Control and Prevention, Arbovirus Disease Branch, Fort Collins, Colorado; University of California, Santa Cruz, California; Fundación Mario Dary, Guatemala City, Guatemala; and Fundación para el Ecodesarrollo, Guatemala City, Guatemala

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María R. López Center for Health Studies, Universidad del Valle de Guatemala, Guatemala; Centers for Disease Control and Prevention, Arbovirus Disease Branch, Fort Collins, Colorado; University of California, Santa Cruz, California; Fundación Mario Dary, Guatemala City, Guatemala; and Fundación para el Ecodesarrollo, Guatemala City, Guatemala

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Jean-Luc Betoulle Center for Health Studies, Universidad del Valle de Guatemala, Guatemala; Centers for Disease Control and Prevention, Arbovirus Disease Branch, Fort Collins, Colorado; University of California, Santa Cruz, California; Fundación Mario Dary, Guatemala City, Guatemala; and Fundación para el Ecodesarrollo, Guatemala City, Guatemala

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Silvia M. Sosa Center for Health Studies, Universidad del Valle de Guatemala, Guatemala; Centers for Disease Control and Prevention, Arbovirus Disease Branch, Fort Collins, Colorado; University of California, Santa Cruz, California; Fundación Mario Dary, Guatemala City, Guatemala; and Fundación para el Ecodesarrollo, Guatemala City, Guatemala

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María L. Müller Center for Health Studies, Universidad del Valle de Guatemala, Guatemala; Centers for Disease Control and Prevention, Arbovirus Disease Branch, Fort Collins, Colorado; University of California, Santa Cruz, California; Fundación Mario Dary, Guatemala City, Guatemala; and Fundación para el Ecodesarrollo, Guatemala City, Guatemala

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A. Marm Kilpatrick Center for Health Studies, Universidad del Valle de Guatemala, Guatemala; Centers for Disease Control and Prevention, Arbovirus Disease Branch, Fort Collins, Colorado; University of California, Santa Cruz, California; Fundación Mario Dary, Guatemala City, Guatemala; and Fundación para el Ecodesarrollo, Guatemala City, Guatemala

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Robert S. Lanciotti Center for Health Studies, Universidad del Valle de Guatemala, Guatemala; Centers for Disease Control and Prevention, Arbovirus Disease Branch, Fort Collins, Colorado; University of California, Santa Cruz, California; Fundación Mario Dary, Guatemala City, Guatemala; and Fundación para el Ecodesarrollo, Guatemala City, Guatemala

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Barbara W. Johnson Center for Health Studies, Universidad del Valle de Guatemala, Guatemala; Centers for Disease Control and Prevention, Arbovirus Disease Branch, Fort Collins, Colorado; University of California, Santa Cruz, California; Fundación Mario Dary, Guatemala City, Guatemala; and Fundación para el Ecodesarrollo, Guatemala City, Guatemala

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Ann M. Powers Center for Health Studies, Universidad del Valle de Guatemala, Guatemala; Centers for Disease Control and Prevention, Arbovirus Disease Branch, Fort Collins, Colorado; University of California, Santa Cruz, California; Fundación Mario Dary, Guatemala City, Guatemala; and Fundación para el Ecodesarrollo, Guatemala City, Guatemala

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Celia Cordón-Rosales Center for Health Studies, Universidad del Valle de Guatemala, Guatemala; Centers for Disease Control and Prevention, Arbovirus Disease Branch, Fort Collins, Colorado; University of California, Santa Cruz, California; Fundación Mario Dary, Guatemala City, Guatemala; and Fundación para el Ecodesarrollo, Guatemala City, Guatemala

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the Arbovirus Ecology Work Group Center for Health Studies, Universidad del Valle de Guatemala, Guatemala; Centers for Disease Control and Prevention, Arbovirus Disease Branch, Fort Collins, Colorado; University of California, Santa Cruz, California; Fundación Mario Dary, Guatemala City, Guatemala; and Fundación para el Ecodesarrollo, Guatemala City, Guatemala

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West Nile virus ecology has yet to be rigorously investigated in the Caribbean Basin. We identified a transmission focus in Puerto Barrios, Guatemala, and established systematic monitoring of avian abundance and infection, seroconversions in domestic poultry, and viral infections in mosquitoes. West Nile virus transmission was detected annually between May and October from 2005 to 2008. High temperature and low rainfall enhanced the probability of chicken seroconversions, which occurred in both urban and rural sites. West Nile virus was isolated from Culex quinquefasciatus and to a lesser extent, from Culex mollis/Culex inflictus, but not from the most abundant Culex mosquito, Culex nigripalpus. A calculation that combined avian abundance, seroprevalence, and vertebrate reservoir competence suggested that great-tailed grackle (Quiscalus mexicanus) is the major amplifying host in this ecosystem. West Nile virus transmission reached moderate levels in sentinel chickens during 2007, but less than that observed during outbreaks of human disease attributed to West Nile virus in the United States.

Author Notes

* Address correspondence to Nicholas Komar, Arbovirus Diseases Branch, CDC-NCEZID-DVBD, 3150 Rampart Road, Fort Collins, CO 80521. E-mail: nck6@cdc.gov
† These authors contributed equally to this work.
‡ Arbovirus Ecology Work Group, in alphabetical order: Cristina Chaluleu, Carmen L. Contreras, Rebekah C. Kading, Eric Edwards, Marvin S. Godsey, Ana S. Gonz´lez, Kathryn P. Huyvaert, Kimberly M. Keene, Jeremy P. Ledermann, Luis Martínez, Bernarda Molina, María de Lourdes Monzón, Janae L. Stovall, Mónica Santiago, Harry M. Savage, and Ginger Young.

Financial support: This research was supported by the Centers for Disease Control and Prevention cooperative agreements #1U01/GH000028, #U50/CCU021236-01, and #3U51/GH000011-02, Consejo Nacional de Ciencia y Tecnología (CONCYT) de Guatemala grant #FD19-03, and Fondo de Ciencia y Tecnología (FODECYT) de Guatemala grant #03-2007. Dr. Kilpatrick's salary was partly supported by grants from the National Science Foundation, EF-0914866, and the National Institutes of Health, 1R01AI090159-01.

Authors' addresses: Maria E. Morales-Betoulle, Danilo Alvarez, María R. López, Silvia M. Sosa, María L. Müller, and Celia Cordón-Rosales, Center for Health Studies, Universidad del Valle de Guatemala, Guatemala, E-mails: me_morales@hotmail.com, dalvarez@ces.uvg.edu.gt, mlopez@ces.uvg.edu.gt, ssosa@ces.uvg.edu.gt, mmuller@ces.uvg.edu.gt, and ccordon@ces.uvg.edu.gt. Nicholas Komar, Arbovirus Diseases Branch, CDC-NCEZID-DVBD, Fort Collins, CO, E-mail: nck6@cdc.gov. Nicholas A. Panella, Robert S. Lanciotti, Barbara W. Johnson, and Ann M. Powers, Centers for Disease Control and Prevention, Arbovirus Diseases Branch, Fort Collins, CO, E-mails: nap4@cdc.gov, rsl2@cdc.gov, bfj9@cdc.gov, and akp7@cdc.gov. Jean-Luc Betoulle, Fundación para el Ecodesarrollo, Office of the Director, Guatemala City, Guatemala, E-mail: betoullejeanluc@gmail.com. A. Marm Kilpatrick, University of California Santa Cruz, Ecology and Evolutionary Biology, Santa Cruz, CA, E-mail: akilpatr@ucsc.edu.

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