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

FABIÁN MÉNDEZGrupo Epidemiología y Salud Poblacional, Escuela de Salud Pública, and Grupo Virus Emergentes y Enfermedad, Departamento de Microbiología, Escuela de Ciencias Básicas, Universidad del Valle, Cali, Colombia

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MAURICIO BARRETOGrupo Epidemiología y Salud Poblacional, Escuela de Salud Pública, and Grupo Virus Emergentes y Enfermedad, Departamento de Microbiología, Escuela de Ciencias Básicas, Universidad del Valle, Cali, Colombia

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JUAN F. ARIASGrupo Epidemiología y Salud Poblacional, Escuela de Salud Pública, and Grupo Virus Emergentes y Enfermedad, Departamento de Microbiología, Escuela de Ciencias Básicas, Universidad del Valle, Cali, Colombia

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GRACIELA RENGIFOGrupo Epidemiología y Salud Poblacional, Escuela de Salud Pública, and Grupo Virus Emergentes y Enfermedad, Departamento de Microbiología, Escuela de Ciencias Básicas, Universidad del Valle, Cali, Colombia

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JAIME MUÑOZGrupo Epidemiología y Salud Poblacional, Escuela de Salud Pública, and Grupo Virus Emergentes y Enfermedad, Departamento de Microbiología, Escuela de Ciencias Básicas, Universidad del Valle, Cali, Colombia

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MARÍA E. BURBANOGrupo Epidemiología y Salud Poblacional, Escuela de Salud Pública, and Grupo Virus Emergentes y Enfermedad, Departamento de Microbiología, Escuela de Ciencias Básicas, Universidad del Valle, Cali, Colombia

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BEATRIZ PARRAGrupo Epidemiología y Salud Poblacional, Escuela de Salud Pública, and Grupo Virus Emergentes y Enfermedad, Departamento de Microbiología, Escuela de Ciencias Básicas, Universidad del Valle, Cali, Colombia

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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.

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