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 aged>2 years.
However, among the dogs aged<2 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. (...)
Mots-clés Pascal : Trypanosomiase, Protozoose, Parasitose, Infection, Trypanosoma cruzi, Kinetoplastida, Protozoa, Réservoir, Chien, Fissipedia, Carnivora, Mammalia, Vertebrata, Evaluation, Facteur risque, Transmission, Animal, Argentine, Amérique du Sud, Amérique, Zone rurale, Incidence
Mots-clés Pascal anglais : Trypanosomiasis, Protozoal disease, Parasitosis, Infection, Trypanosoma cruzi, Kinetoplastida, Protozoa, Reservoir, Dog, Fissipedia, Carnivora, Mammalia, Vertebrata, Evaluation, Risk factor, Transmission, Animal, Argentina, South America, America, Rural area, Incidence
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 98-0508971
Code Inist : 002B05E02B6. Création : 23/03/1999.