title: [Insecticide susceptibility evaluation in Aedes aegypti populations of Caldas, Colombia, in 2007 and 2011].
abstract: BACKGROUND
  Continuous use of insecticides for the control of dengue transmission may lead to decreased susceptibility levels in mosquito vector populations. Timely monitoring is necessary to ensure detection of any potential resistance problems.
  
  
  OBJECTIVE
  To determine the susceptibility status of Aedes aegypti to insecticides used in public health in Caldas, Colombia, during 2007 and 2011.
  
  
  METHODS
  Susceptibility tests to the organophosphates temephos, malathion, fenitrothion and pirimiphos methyl, as well as to the pyrethroid deltamethrin, were carried out using standard World Health Organization and Centers for Disease Control and Prevention protocols.
  
  
  RESULTS
  In 2007, resistance to temephos was detected in Ae. aegypti populations from La Dorada with resistance ratios of 11.5 and 13.3, prompting the Caldas Health Department to suspend the use of this larvicide. A reduction in resistance ratios to temephos was observed in 2011, as well as an apparent resistance to pirimiphos methyl. All Ae. aegypti populations tested were susceptible to deltamethrin, malathion and fenitrothion in both years.
  
  
  CONCLUSIONS
  Evaluating the resistance ratios during two distinct periods allowed a decrease in resistance to be detected after suspension of the use of temephos. Surveillance of mosquito populations for changes in susceptibility levels to the insecticides used in dengue control programs is therefore recommended.
authors.affiliation: Grupo de Entomología, Departamento de Salud Pública, Facultad de Medicina, Universidad Nacional de Colombia, Bogotá, D.C, Colombia.
authors.forename: Marcela
authors.initials: M
authors.lastname: Conde
authors.affiliation: Grupo de Entomología, Departamento de Salud Pública, Facultad de Medicina, Universidad Nacional de Colombia, Bogotá, D.C, Colombia.
authors.forename: Lorena I
authors.initials: LI
authors.lastname: Orjuela
authors.affiliation: Dirección Territorial de Salud de Caldas, Manizales, Colombia.
authors.forename: César Augusto
authors.initials: CA
authors.lastname: Castellanos
authors.affiliation: Grupo de Entomología, Departamento de Salud Pública, Facultad de Medicina, Universidad Nacional de Colombia, Bogotá, D.C, Colombia.
authors.forename: Manuela
authors.initials: M
authors.lastname: Herrera-Varela
authors.affiliation: Centro de Investigaciones de Plagas e Insecticidas, CIPEIN, Buenos Aires, Argentina.
authors.forename: Susana
authors.initials: S
authors.lastname: Licastro
authors.affiliation: Grupo de Entomología, Departamento de Salud Pública, Facultad de Medicina, Universidad Nacional de Colombia, Bogotá, D.C, Colombia.
authors.forename: Martha L
authors.initials: ML
authors.lastname: Quiñones
mesh_terms: D000330:Aedes / Q000187:drug effects*; D000818:Animals; D003105:Colombia; D004351:Drug Resistance; D007306:Insecticides / Q000494:pharmacology*; D013997:Time Factors
chemical_list: D007306:Insecticides