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Relation between infestation with Aedes aegypti immature forms and environmental conditions in rural schools in two municipalities of Colombia


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Tipo de publicación

Científica

Tipología

Investigación y estudios

Medio de publicación

Eventos: Congreso

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Poster 


Aedes aegypti, the primary vector of dengue, breeds primarily in artificial containers, and infestations are often associated with areas that have an inadequate water supply and poor solid waste management. Most rural areas in Colombia have deficiencies in water supply and waste collection. There have been few studies of schools as an important risk environment for the exposure to mosquito bites. This study investigates environmental conditions in rural schools as factors associated with Ae. aegypti infestation.


During November 2011 (rainy season), a survey and direct observation were used to diagnose school environmental conditions related to infrastructure, water management, sanitation and solid waste disposal in 34 rural primary schools in Colombia. All water holding containers were examined and all immature forms of mosquitoes were collected and later identified to species in the laboratory.


From the 34 rural schools, 28 (91.4%) disposed their waste in open land; 10 (29.5%) did not have piped water supply and 22 (64.7%) did not have a daily water supply. Of the 98 large water storage tanks encountered, 27.6% (n=27) were uncovered or improperly covered and 35.3% of schools (n=12) did not wash their tanks. Ae. aegypti immature forms were found in 7 of the 34 schools. The container index was 6.7% (14/223). Of the containers positive for Ae. aegypti, 50% (n=7) were solid waste and 42.9% (n=6) were containers used for rainwater harvesting. Schools without piped water had 4.7 times more Ae. aegypti infestation than schools with piped water. There was 3.3 times more infestation in schools without daily water supply than in those that had.


Conditions regarding water source, frequency of water supply, inadequate washing and covering of tanks, and solid waste disposal in rural schools contribute to the presence of Ae. aegypti breeding sites. These results reinforce the need to improve water supply and solid waste management in rural areas, especially in schools, to lower the risk of exposure to dengue vector mosquitoes.

Autores

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

Fecha de publicación 12 de septiembre de 2012
Fecha de aceptación 13 de marzo de 2013

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