| prevalence of brucella abortus antibodies in equines of a tropical region of mexico. | a cross-sectional study was conducted to determinate the seroprevalence rate of equine brucellosis in the state of tamaulipas, mexico. serum samples from 420 equines were analyzed with the rose bengal test at cell concentrations of 3% (rbt-3%) and 8% (rbt-8%), and positive results were confirmed with the rivanol test (rt). risk factors were determined with the prevalence ratio (pr) and the use of variables generated from a questionnaire administered to the animals' owners. serum from 1 stallion ... | 2006 | 17042384 |