Utilisation d'animaux sentinelles dans l'évaluation de la lutte contre les vecteurs de la maladie

Acta Tropica 45, 331-338 (1988) ORSTOM, Centre de Brazzaville, Congo Utilisation d’animaux sentinelles dans l’évaluation de la lutte contre les vecteurs de la maladie du sommeil Premiers résultats dans un foyer congolais J. P. GOUTEUX,’ A. TOUDIC, D. SINDA Summary Title: The use of sentinel animals to monitor antivectorial control in sleeping sickness: preliminary reports in Congolese focus A large-scale control trial against Glossiiza palpalis palpalis was carried out in the Congo using a new trapping technique. In the same way a test related to the experimental utilization of sentinel animals was performed, concurrently to the classical epidemiological and entomological evaluation. 564 domestic ani- mals (pigs, sheep, goats) were examined parasitologically (wet blood films, Woo/HCT) and serologically (Testryps CATT) in six villages. When a drastic reduction of tsetse populations was achieved (i.e. zero point of apparent den- sity) a parasitological negativation was first noted after one year and a complete serological negativation was observed after two years. If only a relative decrease in the vector’s apparent densities occurred, it was related with a lower of Sero-parasitological prevalence rate. The use of a serological test which was able to detect Trypanosoma congolense antibodies as the Testryp CATT, is a par- ticularly useful technique for estimating the animal transmission level. These first results give some arguments that a ...