mized, non-carrier sheep and goat following infection, and (4) animals other than the sheep and goat following infection. Re- covered animals remain carriers for periods of up to four years; the end point has not been determined. Serology: No work has been attempted. Pathogenicity: Infected blood and organ suspensions produce infection by the sub- cutaneous, intramuscular and intravenous routes. Infectious for sheep, goats and the African antelope, the blesbuck {Damaliscus pygargus albifrons). The eland (Taurotragus oryx oryx) develops a submicroscopic infec- tion. Cattle are refractory. No cases of autosterilization have been observed. Antibiotic therapy: No tests conducted. Aureomycin and terramycin may possibly be as effective for A. ovis as for A. marginale. Source : Observed in the blood of infected sheep and goats. Habitat: Found in arthropods such as Rhipicephalus bursa, Dermacentor silvarum and Ornithodoros lahorensis; also found in the erythrocytes of sheep and goats. Found in Africa, Southern Europe and Asia.
