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Factors associated with the occurrence of Triatoma sordida (Hemiptera: Reduviidae) in rural localities of Central-West Brazil.

Rossi JC, Duarte EC, Gurgel-Gonçalves R - Mem. Inst. Oswaldo Cruz (2015)

Bottom Line: This study estimates the factors of artificial environments (houses and peridomestic areas) associated with Triatoma sordida occurrence.The results show the persistence of T. sordida in peridomestic habitats in rural localities of Central-West Brazil.However, the observed low intradomestic colonisation and minimal triatomine infection rates indicate that T. sordida has low potential to sustain high rates of T. cruzi transmission to residents of these localities.

View Article: PubMed Central - PubMed

Affiliation: Faculdade de Medicina.

ABSTRACT
This study estimates the factors of artificial environments (houses and peridomestic areas) associated with Triatoma sordida occurrence. Manual searches for triatomines were performed in 136 domiciliary units (DUs) in two rural localities of Central-West Brazil. For each DU, 32 structural, 23 biotic and 28 management variables were obtained. Multiple logistic regression analysis was performed in order to identify statistically significant variables associated with occurrence of T. sordida in the study areas. A total of 1,057 specimens (99% in peridomiciles, mainly chicken coops) of T. sordida were collected from 63 DUs (infestation: 47%; density: ~8 specimens/DU; crowding: ~17 specimens/infested DU; colonisation: 81%). Only six (0.6%) out of 945 specimens examined were infected with Trypanosoma cruzi. The final adjusted logistic regression model indicated that the probability of T. sordida occurrence was higher in DU with wooden chicken coops, presence of > 30 animals in wooden corrals, presence of wood piles and presence of food storeroom. The results show the persistence of T. sordida in peridomestic habitats in rural localities of Central-West Brazil. However, the observed low intradomestic colonisation and minimal triatomine infection rates indicate that T. sordida has low potential to sustain high rates of T. cruzi transmission to residents of these localities.

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peridomestic ecotopes for Triatoma sordida (A). Wooden chicken coops (B)and wooden piles (C) presented in the peridomestic area of localities in themunicipality of Posse, state of Goiás, Brazil.
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f02: peridomestic ecotopes for Triatoma sordida (A). Wooden chicken coops (B)and wooden piles (C) presented in the peridomestic area of localities in themunicipality of Posse, state of Goiás, Brazil.

Mentions: Among the 34 variables selected to be included in the multiple logistic regressionmodel, five remained statistically associated with T.sordida occurrence in the final model (Table V). The results indicate that the probability of occurrence ofT.sordida is four times higher in Trombas and, in DUs with wooden chickencoops (Fig. 2A, B), corrals holding > 30animals, DUs with wooden piles in the peridomestic area (Fig. 2C) and those with food storage structures.


Factors associated with the occurrence of Triatoma sordida (Hemiptera: Reduviidae) in rural localities of Central-West Brazil.

Rossi JC, Duarte EC, Gurgel-Gonçalves R - Mem. Inst. Oswaldo Cruz (2015)

peridomestic ecotopes for Triatoma sordida (A). Wooden chicken coops (B)and wooden piles (C) presented in the peridomestic area of localities in themunicipality of Posse, state of Goiás, Brazil.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4489449&req=5

f02: peridomestic ecotopes for Triatoma sordida (A). Wooden chicken coops (B)and wooden piles (C) presented in the peridomestic area of localities in themunicipality of Posse, state of Goiás, Brazil.
Mentions: Among the 34 variables selected to be included in the multiple logistic regressionmodel, five remained statistically associated with T.sordida occurrence in the final model (Table V). The results indicate that the probability of occurrence ofT.sordida is four times higher in Trombas and, in DUs with wooden chickencoops (Fig. 2A, B), corrals holding > 30animals, DUs with wooden piles in the peridomestic area (Fig. 2C) and those with food storage structures.

Bottom Line: This study estimates the factors of artificial environments (houses and peridomestic areas) associated with Triatoma sordida occurrence.The results show the persistence of T. sordida in peridomestic habitats in rural localities of Central-West Brazil.However, the observed low intradomestic colonisation and minimal triatomine infection rates indicate that T. sordida has low potential to sustain high rates of T. cruzi transmission to residents of these localities.

View Article: PubMed Central - PubMed

Affiliation: Faculdade de Medicina.

ABSTRACT
This study estimates the factors of artificial environments (houses and peridomestic areas) associated with Triatoma sordida occurrence. Manual searches for triatomines were performed in 136 domiciliary units (DUs) in two rural localities of Central-West Brazil. For each DU, 32 structural, 23 biotic and 28 management variables were obtained. Multiple logistic regression analysis was performed in order to identify statistically significant variables associated with occurrence of T. sordida in the study areas. A total of 1,057 specimens (99% in peridomiciles, mainly chicken coops) of T. sordida were collected from 63 DUs (infestation: 47%; density: ~8 specimens/DU; crowding: ~17 specimens/infested DU; colonisation: 81%). Only six (0.6%) out of 945 specimens examined were infected with Trypanosoma cruzi. The final adjusted logistic regression model indicated that the probability of T. sordida occurrence was higher in DU with wooden chicken coops, presence of > 30 animals in wooden corrals, presence of wood piles and presence of food storeroom. The results show the persistence of T. sordida in peridomestic habitats in rural localities of Central-West Brazil. However, the observed low intradomestic colonisation and minimal triatomine infection rates indicate that T. sordida has low potential to sustain high rates of T. cruzi transmission to residents of these localities.

Show MeSH
Related in: MedlinePlus