Diagnosis and treatment of secondary ocular diseases in horses (Proceedings)
Equine recurrent uveitis
o Trigger or Initiating factor
Equine recurrent uveitisAny disease capable of producing a chronic or recurrent sensitization of the vascular tunic of the eye. ERU is an immune-mediated disease characterized by delayed hypersensitivity reactions. Potential etiologies include keratouveitis; microbial infections - Leptospira spp. (L. pomona most commonly implicated), Brucella abortus, Streptococcus spp. (Streptococcus equi); Toxoplasma gondii; parainfluenza-3 virus (PI-3); equine viral arteritis virus (EVA); equine influenza virus (EIV); and parasitic infections - Onchocerca cervicalis microfilaria, Strongylus vulgaris. Other suggested inciting conditions include fungi, Chlamydia, mycoplasma, dental abscesses, endotoxemias (pyelonephritis, endometritis), lymphatic neoplasia, blood dyscrasias, and uveal tract trauma with secondary immune reaction.
Leptospirosis and uveitis
o Horses w/serum titers >100
o Appaloosas w/ serum titers >100
o Ocular signs come late