WVC 91st Annual Conference
The point seroprevalence of Anaplasma marginale in Texas cattle was measured using 12,000 serum samples taken from 23 selected Texas auction markets. The overall state prevalence was 15.02%, but there was a higher percentage (>20%) of persistently infected cattle in the western portion of the state. The higher seroprevalence was in areas known to be the home range of the winter tick (Dermacentor albipictus). Management of this biological vector is necessary to control bovine anaplasmosis in those regions.