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Fine-scale predictions of distributions of Chagas disease vectors in the state of Guanajuato, Mexico
López-Cátdenas, Jorge Gonzalez-Bravo, Francisco Ernesto Salazar-Schettino, Paz Maria Gallaga-Solorzano, Juan Carlos Ramírez-Barba, Ector Martinez-Mendez, Joel Sánchez-Cordero, Víctor Peterson, A. Townsend Ramsey, Janine M.
López-Cátdenas, Jorge
Gonzalez-Bravo, Francisco Ernesto
Salazar-Schettino, Paz Maria
Gallaga-Solorzano, Juan Carlos
Ramírez-Barba, Ector
Martinez-Mendez, Joel
Sánchez-Cordero, Víctor
Peterson, A. Townsend
Ramsey, Janine M.
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Abstract
One of the most daunting challenges for Chagas disease surveillance and control in
Mexico is the lack of community level data on vector distributions. Although many states now have
assembled representative domestic triatomine collections, only two triatomine specimens had been
collected and reported previously from the state of Guanajuato. Field personnel from the stateÕs
Secretarõ´a de Salud conducted health promotion activities in 43 of the 46 counties in the state and
received donations of a total of 2,522 triatomine specimens between 1998 and 2002. All specimens were
identiÞed, and live insects examined for Trypanosoma cruzi. In an effort to develop Þne-scale distributional
data for Guanajuato, collection localities were georeferenced and ecological niches were
modeled for each species by using evolutionary-computing approaches. Five species were collected:
Triatoma mexicana (Herrich-Schaeffer), Triatoma longipennis (Usinger), Triatoma pallidipennis
(Stål), Triatoma barberi (Usinger), and Triatoma dimidiata (Latreille) from 201 communities located
at elevations of 870Ð2,200 m. Based on collection success, T. mexicana had the broadest dispersion,
although niche mapping indicates that T. barberi represents the greatest risk for transmission of Chagas
disease in the state. T. dimidiata was represented in collections by a single adult collected from one
village outside the predicted area for all species. For humans, an estimated 3,755,380 individuals are
at risk for vector transmission in the state, with an incidence of 3,500 new cases per year; overall
seroprevalences of 2.6% indicate that 97,640 individuals are infected with T. cruzi at present, including
29,300 chronic cases.
Description
Date
2005-11
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Publisher
Entomological Society of America
Research Projects
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Keywords
Chagas disease, Guanajuato, Mexico, Triatomine, Vector distribution
Citation
López-Cárdenas, J., F. E. González-Bravo, P. M. Salazar-Schettino, J. C. Gallaga-Solórzano, E. Ramírez-Barba, J. Martínez-Méndez, V. Sánchez-Cordero, A. T. Peterson, and J. M. Ramsey. 2005. Fine-scale predictions of distributions of Chagas disease vectors in the state of Guanajuato, Mexico. Journal of Medical Entomology 42:1068-1081. https://doi.org/10.1093/jmedent/42.6.1068