Horizon 1 1 17 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES Research in Veterinary Science 470-477 Trypanosomosis Prevalence Incidence PCV Cattle Burkina Faso 2010 fdi:010049553 ENG Research in Veterinary Science 0034-5288 ISI:000278177300023 3 10.1016/j.rvsc.2009.10.010 https://www.documentation.ird.fr/hor/fdi:010049553 https://www.documentation.ird.fr/intranet/publi/2010/06-2/010049553.pdf 88 Horizon (IRD) The present study was conducted to determine the prevalence and incidence of trypanosomosis and to investigate some factors influencing them in an agro-pastoral area of southwestern Burkina Faso. A total of 363 crossbred cattle (Baoule-zebu peul), which were bred under natural trypanosomosis challenge, were monitored monthly for parasitaemia, packed cell volume (PCV) and serological analyses over 2 years. The parasitological prevalence estimated at the beginning of the survey using the buffy coat technique (BCT) was 7.54%. As much as 66.7% of all trypanosome infections were due to Trypanosoma vivax, 23.8% due to Trypanosoma congolense and 9.5% due to T. vivax/T. congolense mixed infections. The monthly serological incidence varied from 0.29% to 19.29%. The season was the most important factor influencing the serological prevalence and incidence and the animal PCV. The dry hot season is associated with increasing seroprevalences and incidences and consequently a decreasing average of PCV. In addition, an important spatial heterogeneity was observed. 052 ; 080 UR177 Burkina Faso