Composition and biting activity of anopheles (diptera: culicidae) in the Amazon region of Colombia

Mauricio Rodríguez, Ligia Pérez, Juan Carlos Caicedo, Guillermo Prieto, José Antonio Arroyo, Harparkash Kaur, Martha Suárez-Mutis, Fernando De La Hoz, Jo Lines, Neal Alexander*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

To provide information for public health policy on mosquito nets in the Amazon region of Colombia, we conducted landing catches to estimate Anopheles species composition and biting activity. Two hundred twenty person-nights of catches were done in seven locations over a period of 14 mo. A total of 1,780 Anopheles mosquitoes were caught (8.1 per person-night). Among the nine species found, An. oswaldoi Peryassú was the most common (776 mosquitoes, 44%), followed by An. darlingi Root s.l. (498, 28%). An. oswaldoi was the most common species collected outdoors, where its biting rate dropped steadily from a peak of >15 bites/person-night at the start of the night (1800-1900 hours) to ≈ 2 bites/person-night before dawn. An. darlingi was the most common species collected indoors, with a biting rate of ≈ 3-4 bites/person-night until about midnight, when the rate dropped below 1 bite/person-night, before showing a secondary peak before dawn. Sixty-four mosquito nets were analyzed by the technique of high-performance liquid chromatography (HPLC) for levels of deltamethrin (DM). All but two (62) of these were reported by their owners to have been impregnated with insecticide, and 53 were found by HPLC to have deltamethrin. However, one half (32) of the nets had concentrations <4 mg/m2 and therefore were likely to have been inadequately protective. An inverse association was found between the reported time between washes and deltamethrin concentration. These findings show a need for additional protection from mosquitoes when not inside nets, as well as for more effective impregnation, possibly through wash-resistant insecticide formulation.

Original languageEnglish (US)
Pages (from-to)307-315
Number of pages9
JournalJournal of Medical Entomology
Volume46
Issue number2
DOIs
StatePublished - Mar 2009

Keywords

  • Anopheles nyssorhynchus spp.
  • Malaria vectors
  • Mosquito abundance
  • Mosquito nets

ASJC Scopus subject areas

  • Parasitology
  • veterinary(all)
  • Insect Science
  • Infectious Diseases

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