| Babesia ovis | Species described from sheep and goats in many tropical and subtropical areas of the eastern hemisphere as a cause of icterohematuria; it is smaller and less pathogenic than Babesia motasi, and immunologically distinct. (05 Mar 2000) |
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| Anaplasma ovis | A species that causes anaplasmosis in sheep and goats; cattle are refractory. (05 Mar 2000) |
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| Mycoplasma conjunctivae subsp. ovis | A bacterial subspecies associated with pinkeye of sheep. (05 Mar 2000) |
| Corynebacterium ovis | <bacteria> Former name for Corynebacterium pseudotuberculosis. (05 Mar 2000) |
| Taenia ovis | A tapeworm of dogs and foxes whose larval form is found in the muscles of sheep; heavy larval infections in sheep can have severe economic consequences due to condemnation of carcasses at meat inspection. (05 Mar 2000) |
| Eperythrozoon ovis | A species found in sheep, rarely causing disease. (05 Mar 2000) |
| Trichomonas ovis | Former name for Tetratrichomonas ovis. (05 Mar 2000) |
| babesia | A genus of tick-borne protozoan parasites that infests the red blood cells of mammals, including humans. There are many recognised species, and the distribution is world-wide. (12 Dec 1998) |
| Babesia argentina | A species of protozoa that is a cause of bovine babesiosis. Ticks of the genera boophilus, rhipicephalus, and ixodes are the chief vectors. (12 Dec 1998) |
| Babesia berbera | A species of protozoa that is a cause of bovine babesiosis. Ticks of the genera boophilus, rhipicephalus, and ixodes are the chief vectors. (12 Dec 1998) |
| Babesia bigemina | Species that is a cause of bovine babesiosis, transmitted by Boophilus ticks. (05 Mar 2000) |
| babesia bovis | A species of protozoa that is a cause of bovine babesiosis. Ticks of the genera boophilus, rhipicephalus, and ixodes are the chief vectors. (12 Dec 1998) |
| Babesia caballi | Species that is a cause of equine babesiosis in many parts of the world, including the southeastern U.S.; vector ticks are species of Dermacentor, Hyalomma, and Rhipicephalus. (05 Mar 2000) |
| Babesia canis | Species found in dogs, wolves, and jackals in many tropical and subtropical areas of the Americas, Europe, Asia, and Africa; it is most pathogenic in dogs, causing mild to severe canine babesiosis, the severest disease occurring in dogs imported into areas where the disease is enzootic; the most important vector is Rhipicephalus sanguineus. (05 Mar 2000) |
| Babesia divergens | Commonest species of Babesia in western and central Europe, causing a disease of cattle similar to that produced by Babesia bovis; vector tick is Ixodes ricinus; it has caused human babesiosis in splenectomised individuals in France, Ireland, Scotland, Croatia, Georgia, a part of the former Soviet Union, and Sweden; also found in reindeer. (05 Mar 2000) |
| Babesia equi | Species that occurs in horses, mules, donkeys, and zebras; it has a geographic distribution similar to that of Babesia caballi, but is smaller and more pathogenic, causing equine babesiosis. (05 Mar 2000) |