| onchocerca | A genus of parasitic nematodes whose organisms live and breed in skin and subcutaneous tissues. Onchocercal microfilariae may also be found in the urine, blood, or sputum. (12 Dec 1998) |
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| Onchocerca cervicalis | A species common in the ligamentum nuchae of horses, mules, and asses, where it has been suspected of playing a role in fistulous withers and poll evil. (05 Mar 2000) |
| Onchocerca gibsoni | A species that infects the subcutaneous tissues of cattle, buffalo, and sheep. (05 Mar 2000) |
| Onchocerca lienalis | A species that inhabits the connective tissue around the ligamentum nuchae, tibiofemoral ligament, spleen capsule, and other sites in cattle and buffalo; although widely distributed, it is not common in the U.S. (05 Mar 2000) |
| onchocerca volvulus | A species of parasitic nematodes widely distributed throughout central africa and also found in northern south america, southern mexico, and guatemala. Its intermediate host and vector is the blackfly or buffalo gnat. (12 Dec 1998) |
| Onchocerca volvulus L3 cysteine protease | <enzyme> Required for molting of o. Volvulus third stage larvae; genbank u71150 Registry number: EC 3.4.22.- Synonym: cysteine protease l3, o volvulus, lovcp (26 Jun 1999) |