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Demographic and Dispersal Constraints for Domestic Infestation by Non-Domicilated Chagas Disease Vectors in the Yucatan Peninsula, Mexico

Chagas disease is one of the most important diseases in Latin America. Insecticides have been sprayed to control domiciliated vectors. However, some triatomine species are not strictly domiciliated, and the transmission risk posed by immigrants is identified as a major challenge. The design of new control strategies requires disentangling the importance of demography and immigration in vector occurrence inside houses. Using a population dynamics model, we confirmed that dispersal can explain satisfactorily the domestic abundance of Triatoma dimidiata in Yucatan, Mexico. A surprisingly low fecundity was also required (no more than one to two female offspring per female per trimester). A wide range of survival probabilities was possible, although the best fit was obtained for a very low immature survival ( 0.01/trimester). Our model predicted that domestic populations are not sustainable, and up to 90% of the individuals found in houses are immigrants. We discuss the potential of different strategies to control the transmission of Chagas disease by non-domiciliated vectors.

Received June 7, 2007. Accepted for publication September 14, 2007.

Financial support: Financial support has been provided by the program "Action des coopérations scientifiques avec l’Argentine" ECOS SUD (A04B02, Resp. C. Bernstein) to JR and FM and Grant 20020404 from SISIERRA/CONACYT to ED. This study received financial assistance from UNICEF/UNDP/World Bank/WHO special Programme for Research and Training in Tropical Diseases (TDR) Grant A60640 to SG.

^* Address correspondence to Sébastien Gourbière, Laboratoire de Mathématiques, Physique et Systèmes (EA 4217), Université de Perpignan Via Domitia, 52 Avenue Paul Alduy, 66860 Perpignan Cedex, France. E-mail: gourbier{at}univ-perp.fr

Authors’ addresses: Sébastien Gourbière and Raissa Minkoue, Laboratoire de Mathématiques, Physique et Systèmes (EA 4217), Université de Perpignan, Via Domitia, 52 Avenue Paul Alduy, 66860 Perpignan Cedex, France, Telephone: 33-4-68-66-17-63, Fax: 33-4-68-66-17-60, E-mail: gourbier{at}univ-perp.fr. Eric Dumonteil, Laboratorio de Parasitología, Centro de Investigaciones Regionales "Dr. Hideyo Noguchi," Universidad Autónoma de Yucatán, Ave. Itzaes 490 x 50, 97000 Mérida, Yucatán, Mexico, Telephone: 52-999-924-5910, Fax: 52-999-923-6120, E-mail: oliver{at}uady.mx. Jorge Rabinovich, Centro de Estudios Parasitológicos y de Vectores, Universidad Nacional de La Plata, La Plata, Argentina, Telephone: 54-221-423-3471, Fax: 54-221-423-2327, E-mail: jorge{at}ecopaedia.com.ar. Frédéric Menu, Laboratoire de Biométrie et Biologie Evolutive, UMR CNRS 5558, Université de Lyon, Université Lyon 1, Villeurbanne F-69622, France, Telephone: 33-4-72-43-29-03, Fax: 33-4-72-43-13-88, E-mail: menu{at}biomserv.univ-lyon1.fr.