| serodiagnosis of equine monocytic ehrlichiosis in selected groups of horses in minnesota. | antibody titer to ehrlichia risticii was determined, in 2,549 equine serum samples, using an indirect fluorescent antibody assay. during 1986, samples were obtained from the minnesota state-federal equine infectious anemia diagnostic laboratory, the minnesota racing laboratory, from horses admitted to the university of minnesota veterinary teaching hospital, and as a result of field investigations of horses with acute diarrhea. results of the study revealed antibody prevalence of 33, 24, 47, and ... | 1990 | 2195001 |