Prevalency and Risk Factors Associated with Brucellosis in Cattle in the Municipality of São Francisco do Brejão, Maranhão, Brazil

This objective study was to determine the prevalence of brucellosis-positive cattle and identify the possible associated risk factors in dairy cattle herds. The study design, serum samples and information regarding farm properties were as used within the context of the National Program for Brucellosis and Tuberculosis Control and Eradication, for studying bovine brucellosis in the state of Maranh?o. In total 736 animals originating from 96 herds were enrolled in the study. Of the analysed samples 3.94% of animals tested positive for Brucella, the resulting herd prevalence was 30.43%. The variables considered to be risk factors for infection were: number of animal movements, pasture used in common with other farms, abortion residues left in the field, animals over 64 months of age and acquisition of cattle with the purpose of fattening. Brucellosis presents prevalence low and that factors relating to the characteristics of the farm properties and management of the animals are associated with the disease.