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Distribution and infection of triatomines (Hemiptera: Reduviidae) by Trypanosoma cruzi in the state of Michoacán, Mexico

2011; Instituto Oswaldo Cruz, Ministério da Saúde; Volume: 106; Issue: 4 Linguagem: Inglês

10.1590/s0074-02762011000400010

1678-8060

José Alejandro Martínez‐Ibarra, Ignacio Valencia-Navarro, Salvador León-Saucedo, Gabriela Ibáñez-Cervantes, Rafael Bustos-Saldaña, Oziel Dante Montañez‐Valdez, Óscar Iván Cervantes Díaz, Benjamín Nogueda‐Torres,

Helminth infection and control

An entomological study of triatomine species was carried out to assess their prevalence in 10 localities of the state of Michoacán, Mexico. Entomological indices were calculated to estimate the risk for vector-borne transmission of Trypanosoma cruzi to the human population in this area. Four triatomine species (Triatoma barberi, Triatoma dimidiata, Meccus pallidipennis and Meccus longipennis) were collected from the study area. This is the first report of M. longipennis and T. dimidiata in Michoacán. M. pallidipennis was significantly (p < 0.05) more abundant than any of the other species collected in the study area. Infection indices were greater than 50% for each of the four collected triatomine species. Significantly more triatomines were collected from intradomiciliary areas than from peridomiciliary or sylvatic areas. Infestation, crowding and density indices were low, whereas colonisation indices were high in five localities. The current vectorial conditions in the study area require continuous entomological and serological surveillance to diminish the risk of T. cruzi transmission to human populations.