Epidemiological characterization of reported cases of brucellosis in cattle in the western region of the state of Santa Catarina, Brazil

EnglishBrucellosis is one of the most important and widespread bacterial zoonoses in the world. There are few epidemiological studies on brucellosis in cattle in the productive region of western Santa Catarina. Thus, the objective of this study was to characterize the epidemiological aspects of bovine brucellosis reported in this region from 2013 to 2018. Cattle data were provided by the Integrated Company for Agricultural Development of Santa Catarina (Companhia Integrada de Desenvolvimento Agricola de Santa Catarina - CIDASC). The prevalence of the disease was evaluated in cattle and herds by means of temporal trend analysis and spatial distribution. Bovines with tests showing positive for brucellosis were analyzed for location (municipality) and year of confirmation of diagnosis. In the study period (2013-2018), 686,086 tests were performed for brucellosis, with a prevalence rate of 1.11% (7,586/686,086). Among the 80,171 herds tested, 0.95% were found to be positive (764/80171). The odds ratio of brucellosis occurrence in cattle increased significantly in 2015 (OR = 1.55) and 2016 (OR = 1.97) and decreased in 2014 (OR = 0.47) and 2017 (OR = 0.97). The disease is present in cattle in 61.07% (80/131) of the municipalities where the tests were performed. Results showed that brucellosis is endemic in the region portuguesA brucelose e uma das zoonoses bacterianas mais importantes e difundidas no mundo. Sao poucos os estudos epidemiologicos sobre a doenca em bovinos na regiao produtiva do Oeste de Santa Catarina. Desta forma, o objetivo deste estudo foi caracterizar os aspectos epidemiologicos da brucelose bovina notificados nesta regiao entre os anos de 2013 a 2018. Os dados sobre os bovinos foram fornecidos pela Companhia Integrada de Desenvolvimento Agricola de Santa Catarina (CIDASC). Foram avaliadas as prevalencias da doenca nos bovinos e rebanhos, por meio de analise de tendencia temporal e distribuicao espacial. Os bovinos, cujo exame confirmatorio mostrou positividade para brucelose, foram analisados quanto a localizacao (municipio) e o ano de confirmacao do diagnostico. No periodo de estudo (2013-2018) foram realizados 686.086 testes para brucelose, encontrando-se prevalencia de 1,11% (7.586/686.086) de animais positivos, enquanto a prevalencia de rebanhos positivos, dentre os 80.171 testados, foi de 0,95% (764/80171). As razoes de chances de ocorrencia de brucelose nos bovinos aumentaram significativamente nos anos de 2015 (OR= 1,55) e 2016 (OR= 1,97) e diminuiram em 2014 (OR= 0,47) e 2017 (OR= 0,97). A doenca esta presente nos bovinos em 61,07% (80/131) dos municipios em que foram realizados os testes. Os resultados demonstram que a brucelose e endemica na regiao