New scenarios of Trypanosoma cruzi transmission in the Orinoco region of Colombia

Rhodnius prolixus, a blood-sucking triatomine with domiciliary anthropophilic habits, is the main vector of Chagas disease. The current paradigm of Trypanosoma cruzi transmission in Columbia includes a sylvatic and domiciliary cycle co-existing with domestic and sylvatic populations of reservoirs. T...

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Bibliographic Details
Published in:Memórias do Instituto Oswaldo Cruz 2015-05, Vol.110 (3), p.283-288
Main Authors: Rendón, Lina María, Guhl, Felipe, Cordovez, Juan Manuel, Erazo, Diana
Format: Article
Language:English
Subjects:
Animals
Attalea butyracea
Chagas disease
Chagas Disease - transmission
Colombia
Dogs
infection index
infestation index
insect domiciliation
Insect Vectors - classification
Insect Vectors - parasitology
Mammals - parasitology
PARASITOLOGY
Population Density
Rhodnius prolixus
TROPICAL MEDICINE
Trypanosoma cruzi - isolation & purification
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Summary:Rhodnius prolixus, a blood-sucking triatomine with domiciliary anthropophilic habits, is the main vector of Chagas disease. The current paradigm of Trypanosoma cruzi transmission in Columbia includes a sylvatic and domiciliary cycle co-existing with domestic and sylvatic populations of reservoirs. The aim of this study is to evaluate the population densities and relative abundance of triatomines and mammals that may be involved in the sylvatic cycle of Chagas disease to clarify the epidemiological scenario in an endemic area in the province of Casanare. Insect vectors on Attalea butyracea palms were captured using both manual searches and bait traps. The capture of mammals was performed using Sherman and Tomahawk traps. We report an infestation index of 88.5% in 148 palms and an index of T. cruzi natural infection of 60.2% in 269 dissected insects and 11.9% in 160 captured mammals. High population densities of triatomines were observed in the sylvatic environment and there was a high relative abundance of reservoirs in the area, suggesting a stable enzootic cycle. We found no evidence of insect domiciliation. Taken together, these observations suggest that eco-epidemiological factors shape the transmission dynamics of T. cruzi, creating diverse scenarios of disease transmission.
ISSN:1678-8060
0074-0276
1678-8060
DOI:10.1590/0074-02760140403