Effect of vaccination on the apparent prevalence of bovine brucellosis in the state of Tocantins, Brazil

A cross-sectional study on the epidemiological situation of bovine brucellosis was carried out in state Tocantins to evaluate effectiveness its vaccination program. The divided into five regions, and a predetermined number farms randomly selected each one. Females aged 24 months or older were farm diagnosed with by serial serology (AAT 2-ME). total 6,846 animals from 756 examined. prevalence seropositive herds 6.42% [CI95%: 4.76-8.62], 2.21% 1.05-4.01]. homogeneously distributed among regions. 2002/2003 estimated be 21.22% 19.33-23.11]. In conclusion, program implemented Tocantins, reaching coverage above 70% as 2010, significantly reduced herds. Thus, continuing is recommended, preferably increasing quality processes involved, commercialization inoculation animals, since immunization remains most effective means reduce brucellosis. addition, animal replacement major risk factor for 20022003; therefore, must implement strong health education explaining farmers importance testing before introducing them their