Importance of Species of Triatominae (Heteroptera: Reduviidae) in Risk of Transmission of Trypanosoma cruzi in Western Mexico

Authors: Martínez-Ibarra, J. A.; Grant-Guillén, Y.; Morales-Corona, Z. Y.; Haro-Rodriguez, S.; Ventura-Rodríguez, L. V.; Nogueda-Torres, B.; Bustos-Saldaña, R.

Source: Journal of Medical Entomology, Volume 45, Number 3, May 2008 , pp. 476-482(7)

Publisher: Entomological Society of America

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Journal of Medical Entomology is published bimonthly in January, March, May, July, September, and November. The journal publishes reports on all phases of medical entomology and medical acarology, including the systematics and biology of insects, acarines, and other arthropods of public health and veterinary significance.

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Abstract:

The epidemiological risk of infection by Trypanosoma cruzi Chagas in human populations of western Mexico is still under study. Although most vectors in this region and their vector capability are already known, new studies estimating the risk and the importance of individual Triatominae species (Hemiptera: Reduviidae) for T. cruzi transmission are necessary. For 1 yr, every month, >400 human dwellings and their surroundings in eight communities of two western Mexico states were searched for triatomines. More than1,000 specimens representing four species were collected and checked for T. cruzi infection. Based on the usual entomological indices, only the inhabitants of Gavilán El Progreso-La Villita are at serious risk of vectorial infection by T. cruzi. A population of Meccus longipennis (Usinger) was found living in peridomestic rock pile boundary walls after an insecticide spraying. It was confirmed the major role of peridomestic habitats as shelter areas for triatomines, particularly in rock pile boundary walls and chicken roosts. Triatominae presence also was verified in certain sylvatic habitats, including primarily heaps of stones. The important role of M. longipennis in the potential transmission of T. cruzi in the region and the secondary role of M. picturatus (Usinger) and Triatoma barberi Usinger also were confirmed. Null colonization of houses by T. barberi, which was collected primarily in peridomestic habitats, differs from its common intradomiciliary collection in other studies. Meccus pallidipennis (Stål) most probably does not exist in Nayarit. Meccus mazzottii (Usinger) and Meccus phyllosomus (Burmeister) are no longer found in Nayarit and Jalisco. Additional studies are necessary to determine the current epidemiological situation in other areas of western Mexico.

Keywords: Triatominae; epidemiological role; Mexico

Document Type: Research article