Environmental factors associated with American cutaneous leishmaniasis in a new Andean focus in Colombia

C. B. Ocampo, M. C. Ferro, H. Cadena, R. Gongora, M. Pérez, C. H. Valderrama-Ardila, R. J. Quinnell, N. Alexander

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Objective To evaluate the environmental and ecological factors associated with Leishmania transmission and vector abundance in Chaparral, Tolima-Colombia. Methods First, we compared the ecological characteristics, abundance of phlebotomies and potential reservoir hosts in the peridomestic environment (100m radius) of randomly selected houses, between two townships with high and low cutaneous leishmaniasis incidence. Second, we examined peridomestic correlates of phlebotomine abundance in all 43 houses in the higher risk township. Results The high transmission township had higher coverage of forest (23%vs. 8.4%) and shade coffee (30.7%vs. 11%), and less coffee monoculture (16.8%vs. 26.2%) and pasture (6.3%vs. 12.3%), compared to the low transmission township. Lutzomyia were more abundant in the high transmission township 2.5 vs. 0.2/trap/night. Lutzomyia longiflocosa was the most common species in both townships: 1021/1450 (70%) and 39/80 (49%). Numbers of potential wild mammal reservoirs were small, although four species were found to be infected with Leishmania (Viannia) spp. In the high transmission township, the overall peridomiciliary capture rate of L. longiflocosa was 1.5/trap/night, and the abundance was higher in houses located nearer to forest (ρ=-0.30, P=0.05). Conclusion The findings are consistent with a domestic transmission cycle with the phlebotomies dependent on dense vegetation near the house.

Original languageEnglish (US)
Pages (from-to)1309-1317
Number of pages9
JournalTropical Medicine and International Health
Volume17
Issue number10
DOIs
StatePublished - Oct 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Parasitology
  • Public Health, Environmental and Occupational Health
  • Infectious Diseases

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