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Los patrones de la dinámica de infestación de los hogares por Triatoma dimidiata no domiciliado revelan un gradiente especial de infestación en poblados rurales y una potencial manipulación de insectos por Trypanosoma cruzi
Author(s) -
RamirezSierra Maria Jesus,
HerreraAguilar Melba,
Gourbière Sébastien,
Dumonteil Eric
Publication year - 2010
Publication title -
tropical medicine and international health
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.056
H-Index - 114
eISSN - 1365-3156
pISSN - 1360-2276
DOI - 10.1111/j.1365-3156.2009.02422.x
Subject(s) - chagas disease , infestation , biological dispersal , vector (molecular biology) , trypanosoma cruzi , triatoma , biology , triatominae , transmission (telecommunications) , zoology , ecology , parasite hosting , hemiptera , virology , population , reduviidae , environmental health , medicine , biochemistry , botany , world wide web , computer science , electrical engineering , recombinant dna , engineering , gene
Summary Objective Chagas disease is a major vector‐borne parasitic disease in Latin America, primarily transmitted to humans by triatomine vectors. Non‐domiciliated triatomine species such as Triatoma dimidiata in the Yucatan peninsula, Mexico, can transiently invade houses and are emerging as a major challenge to control Trypanosoma cruzi transmission to humans. We analyzed the spatio‐temporal spreading of house infestation by T. dimidiata in four rural villages. Methods Triatomines were collected in four rural villages over a 2 years period, and the spatio‐temporal patterns of infestation were analyzed. Results Triatomines were consistently more abundant at the periphery of villages than in centers, indicating a much higher risk of T. cruzi transmission at the periphery. Male T. dimidiata were found further in the center of the village, while females remained closer to the periphery, suggesting differential dispersal capabilities between sexes, although the timing of dispersal appeared identical. Surprisingly, infected females were consistently collected in houses much further from the surrounding bushes than non‐infected females, while the distribution of males was unaffected by their T. cruzi infection status, suggesting an increased dispersal capability in infected females. Conclusion The spatial structure of infestation should be taken into account for the prioritization of vector control activities within villages, and spatially targeted interventions may be explored. A potential vector manipulation by T. cruzi, observed for the first time in triatomines, may favor parasite transmission to new hosts.