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HUMAN AND MOSQUITO INFECTIONS BY DENGUE VIRUSES DURING AND AFTER EPIDEMICS IN A DENGUE–ENDEMIC REGION OF COLOMBIA

We conducted a study in a dengue-endemic area of Colombia to evaluate the dynamics of transmission of dengue viruses during and after epidemics. Information was simultaneously gathered about occurrence of infection in humans and mosquitoes every three months in four cities with endemic transmission. Viral isolation was confirmed in 6.7% of the persons and most were asymptomatic. Adult mosquito and larvae house indexes were not found associated with increased burden of disease. The only entomologic indicator related to dengue infection in humans was the pooled infection rate of mosquitoes. Aedes aegypti infection rates showed significant differences between the epidemic (10.68, 95% confidence interval [CI] = 7.04–15.62) and after epidemic periods of the study (6.15, 95% CI = 3.46–10.19). In addition, Ae. albopictus were also infected with dengue viruses. Increases in mosquito infection rates were associated with increases in human infection rates in the following trimester.

Received July 5, 2005. Accepted for publication December 6, 2005.

Acknowledgments: We are grateful to the students and families for participating in the study, and the staff of the Valle del Cauca State and the Cali municipality Secretariats of Health for their collaboration during mosquito surveys.

Financial support: This study was supported by a grant from the Colombian Science Council (COLCIENCIAS) and the Universidad del Valle.

^* Address correspondence to Fabián Méndez, Grupo Epidemiología y Salud Poblacional, Escuela de Salud Pública, Universidad del Valle, San Fernando, Calle 4B No. 36-140, Edificio 118, Cali, Colombia. E-mail: famendez{at}univalle.edu.co

Authors’ addresses: Fabián Méndez, Grupo Epidemiología y Salud Poblacional, Escuela de Salud Pública, Universidad del Valle, San Fernando, Calle 4B No. 36-140, Edificio 118, Cali, Colombia, Fax: 57-2-557-0425, E-mail: famendez{at}univalle.edu.co. Mauricio Barreto, Juan F. Arias, Graciela Rengifo, Jaime Muñoz, María E. Burbano, and Beatriz Parra, Departamento de Microbiología, Escuela de Ciencias Básicas, Universidad del Valle, San Fernando, Calle 4N No. 36-140, Cali, Colombia, Fax: 57-2-558-1936.

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