Guzman-Gomez D., Salas-Gonzalez G., Lopez-Monteon A., Welsh-Rodriguez C. M., Torres-Montero J., Dumonteil E., Waleckx Etienne, Ramos-Ligonio A. (2021). Risk factors for infestation by Triatoma dimidiata in a rural locality of Veracruz, Mexico, with active transmission of Trypanosoma cruzi : weather and rain as factors. Tropical Medicine and International Health, [Early access], p. [11 p.]. ISSN 1360-2276.
Titre du document
Risk factors for infestation by Triatoma dimidiata in a rural locality of Veracruz, Mexico, with active transmission of Trypanosoma cruzi : weather and rain as factors
Année de publication
2021
Auteurs
Guzman-Gomez D., Salas-Gonzalez G., Lopez-Monteon A., Welsh-Rodriguez C. M., Torres-Montero J., Dumonteil E., Waleckx Etienne, Ramos-Ligonio A.
Source
Tropical Medicine and International Health, 2021,
[Early access], p. [11 p.] ISSN 1360-2276
Objective To analyse the ecological and social factors involved in infestation of houses by Triatoma dimidiata in a rural locality of Veracruz, Mexico, where active transmission of the parasite is occurring. Methods A survey was applied to the households of the locality to obtain sociodemographic data. In parallel, T. dimidiata insects were collected during one year through community participation. Using PCR, the insects were genotyped, their infection status was assessed, and parasite genotypes infecting the insects were identified. The vector's blood meal sources were identified using a polymerase-heteroduplex chain reaction assay. Results Seasonal variations in the patterns of infestation by T. dimidiata were observed. An overall infestation rate of 19.46%, a colonisation index of 9.09%, a dispersion rate of 22.15% and a synanthropy index of 80.6% were found. The collected insects were identified as ITS-2 group 2 insects, and a natural infection with T. cruzi of 54.35% was found. TcI and no-TcI genotypes of T. cruzi were found in infected insects. Factors such as rain (P = 0.0006) and temperature (P < 0.0001) were associated with infestation. Analysis of the blood meal sources indicated frequent feeding upon humans and mice. Furthermore, house materials and peridomiciles were found to play an important role in the dynamics of infestation. Conclusions The contribution of this study is important for understanding the epidemiology of Chagas disease in rural areas of the state of Veracruz and will help to the establishment of an entomological surveillance system and implementation of prevention and control measures in accordance with the reality of the area.
Plan de classement
Sciences du milieu [021]
;
Santé : généralités [050]
;
Entomologie médicale / Parasitologie / Virologie [052]
;
Santé : aspects socioculturels, économiques et politiques [056]
Description Géographique
MEXIQUE ; VERACRUZ
Localisation
Fonds IRD [F B010081361]
Identifiant IRD
fdi:010081361
