SEROPREVALENCE OF BOVINE ANAPLASMOSIS IN OKLAHOMA FROM 1977 TO 1991

The prevalence of anaplasmosis in Oklahoma cattle was determined on th e basis of the standardized Anaplasma marginale complement fixation te st on 20,155 sera submitted to the Oklahoma Animal Disease Diagnostic Laboratory during a 15-year period. Rates of seropositivity ranged fro m 4.7% to 17.6% on samples submitted for anaplasmosis testing of adult cows. The geographic distribution of recorded cases of anaplasmosis w as 35 Oklahoma counties in 1977 and 48 Oklahoma counties in 1991.