Evaluation of dogs as sentinels of the transmission ofTrypanosoma cruziin a rural area of north-western Argentina
| Autor: | Marta A. Lauricella, Ricardo E. Gürtler, Mónica B. Castañera, R. Chuit |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Chagas disease
Veterinary medicine Trypanosoma cruzi 030231 tropical medicine Argentina Rural Health Serology 03 medical and health sciences Dogs 0302 clinical medicine Risk Factors 030225 pediatrics parasitic diseases Triatoma infestans medicine Animals Humans Chagas Disease Dog Diseases Triatoma Seroconversion biology Incidence (epidemiology) biology.organism_classification medicine.disease Infectious Diseases Regression Analysis Parasitology Sentinel Surveillance Trypanosomiasis |
| Zdroj: | Annals of Tropical Medicine & Parasitology. 92:671-683 |
| ISSN: | 1364-8594 0003-4983 |
| DOI: | 10.1080/00034983.1998.11813327 |
| Popis: | Dogs, the main domestic reservoirs of Trypanosoma cruzi in the Argentine chaco, may be useful as sentinels of vector-mediated transmission of Trypanosoma cruzi in control programmes if canine infections acquired by all other routes could be excluded. In the present study, in the province of Santiago del Estero, Argentina, the dog populations in the neighbouring villages of Amamá, Trinidad, Mercedes, Villa Matilde and Pampa Pozo were studied immediately before spraying of residual insecticides (in 1992 in Amamá, Trinidad and Mercedes and 1993-1994 in the other villages) and twice during a subsequent programme of triatomine surveillance (in 1994 and 1996). Overall seropositivity for Trypanosoma cruzi infection (i.e. the proportion of dogs found positive by at least two different serological tests in any one survey) steadily declined from 65% (54/83) in 1992 to 39% (70/182) in 1994 and 15% (36/237) in 1996. No seroconversion was detected between the 1994 and 1996 surveys in any dog aged2 years. However, among the dogs aged2 years (which were born after virtual elimination of Triatoma infestans from the villages), seropositivity fell from 15% (12/81) in 1994 to 5% (6/131) in 1996. Thirteen demographic, behavioural and entomological variables were analysed by logistic multiple-regression analysis for their association with seropositivity in dogs born locally during the surveillance programme. The total number of Triatoma guasayana collected in the bedroom areas of the owner's house, having a mother which was seropositive for Trypanosoma cruzi, and the number of seropositive dogs with which it cohabited were all found to be significant predictors of seropositivity in any dog. The results are the first indication that Triatoma guasayana is the vector responsible for the new cases of Trypanosoma cruzi infection seen in dogs in domestic or peridomestic sites during the surveillance programme. |
| Databáze: | OpenAIRE |
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