Presence of Aedes aegypti in rural primary schools in two communities in Colombia

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Investigación y estudios

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Eventos: Congreso



Schools may be an important location of infection of dengue in children. Dengue transmission risk in individuals may increase three-fold when taking into account potential exposure at non-household locations. The relatively few studies carried out in schools show conflicting evidence regarding their importance as transmission foci. For example, in Thailand, there was not clear evidence of ongoing transmission in schools, whereas in Mexico, DENV-infected mosquitoes were collected in schools and presented a high risk of infection to students, teachers, and other personnel. The present study investigated dengue risk factors in rural schools in Colombia. Material and Methods: Mosquito collections were carried out in rural schools in Anapoima and La Mesa municipalities in Cundinamarca department, Colombia in August (dry season) and November (rainy season) of 2011. All containers in all rural schools (17 schools in each municipality) were inspected for immature mosquitoes. Adult mosquitoes were collected in classrooms, toilets, dining rooms, kitchens and bedrooms using Prokopack aspirators. Species identification of collected specimens was done in the laboratory using appropriate keys. Results: A total of 3060 adult mosquitoes were collected, of which Culex quinquefasciatus was the most abundant species (86%), followed by Aedes aegypti (10%). There were more Ae. aegypti collected during the rainy season than in the dry season. Adults Ae. aegypti were present in 18 schools in the wet season (53%) and in 14 schools during the dry season (41%). The majority of female Ae. aegypti was collected from classrooms (51%), toilets (17%) and kitchens (13%). Aedes aegypti immatures were collected in 7 schools during the wet season (21%) and in 6 schools during the dry season (18%), corresponding to Breteau indices of 41 and 18, respectively. The most common Ae. aegypti breeding sites were storage containers for drinking water and other containers (e.g. jars, bottles, tank lids, and abandoned toilets). The adult Ae. aegypti infestation rates were higher in Anapoima (14 of 17 schools) than in La Mesa (8 of 17 schools), whereas immature rates were the same in both municipalities (5 positive schools in each municipality). Main conclusions: High Ae. aegypti infestation levels were found in rural schools in Anapoima and La Mesa municipalities. Schools may, therefore, be an important source of transmission of dengue to children in this area. The results further suggest that not only urban, but also rural areas are at risk for dengue infection. Mosquito infestations in schools will be monitored prospectively during an intervention trial over the next 2 years


Olano VA, Matiz MI, Vargas SL, Jaramillo JF. Sarmiento DM, Lenhart A, Stenström TA, Overgaard HJ.

Fecha de publicación 24 de septiembre de 2012
Fecha de aceptación 11 de marzo de 2013

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