Two common and distinct forms of ovine posthitis and vulvitis are recognized. The first, referred to as enzootic posthitis and vulvitis, is associated with high-protein diets, infection with Corynebacterium renale or other urease-producing organisms, locally high concentrations of ammonia, and severe posthitis. The second is referred to as necrotic or ulcerative balanoposthitis and vulvitis. Its cause is unclear, but Mycoplasma mycoides mycoides is implicated as are other Mycoplasma spp organisms of the Histophilus/ Haemophilus group, and potentially viruses.
Last full review/revision July 2011 by Robert O. Gilbert, BVSc, MMedVet, DACT, MRCVS