Chemotherapy of acute bovine anaplasmosis.

The efficacy of a standard tetracycline, imidocarb and a new experimental long-acting tetracycline (T-200) in the treatment of anaplasmosis was examined in 5 groups of 9 nonsplenectomised, adult, 4-year-old, speyed cattle. The efficacy of T-200 was further examined using 9 splenectomised calves. One treatment of imidocarb (3.5 mg/kg) or T-200 (20 mg/kg) or 2 treatments (10 mg/kg) of a standard tetracycline were very effective in controlling the infection in the intact cattle. On inoculation of T-200 (20 mg/kg) controlled infection in 5 splenectomized calves, whereas all 4 untreated control calves died. T-200 did not sterilise either intact or splenectomised cattle.