A study to characterize the epidemiological situation of bovine brucellosis in the State of Paraná was carried out. In this study, the State was divided into seven regions. Three hundred herds were randomly sampled in each region and a pre-established number of animals were sampled in each of these herds. A total of 1,4857 serum samples from 2,098 herds were collected. In each herd, it was applied an epidemiological questionnaire regarding herd features and also husbandry and sanitary practices that could be associated with risk of infection. The serum samples were screened for antibodies against Brucella spp. by the Rose-Bengal test (RBT), and all RBT-positive sera were re-tested by the 2-mercaptoethanol test (2-ME). A herd was considered positive if at least one animal was positive on both RBT and 2-ME tests. The prevalences of infected herds and infected animals in Paraná State were 4.0% [3.2-4.8%] and 1.7% [1.1-2.4%], respectively. In the regions, the prevalences of infected herds and animals were: region 1, 14.7% [10.9-19.2%] and 2.8% [1.2-4.4%]; region 2, 8.8% [5.9-12.6%] and 2.4% [1.0-3.8%]; region 3, 3.4% [1.6-6.1%] and 0.85% [0.21-1.5%]; region 4, 2.3% [0.94-4.8%] and 0.83% [0.02-1.6%]; region 5, 2.3% [0.94-4.7%] and 1.7% [0.06-3.3%]; region 6, 0.34% [0-1.9%] and 0.09% [0-0.27%]; and region 7, 1.0% [0.21-2.9%] and 2.2% [0-6,0%]. The risck factors (odds ratio, OR) associated with the presence of the infection were: purchase of animals for breeding (OR= 2.20 [1.42-3.40]) and pasture rental practice (OR=2.45 [1.54-3.90]).
cattle; brucellosis; prevalence; risk factors; Paraná; Brazil