| Chorioretinitis frequently is a manifestation of systemic infectious disease; it is important as both a convenient diagnostic clue and a prognosticator of visual function. Unless the lesions are generalized or involve the optic nerve, they often are “silent.” Scars may be differentiated from active lesions by the haze and ill-defined borders of the latter. Routine ophthalmoscopic examinations of all animals with systemic diseases often permit rapid diagnosis of many specific
diseases. Chorioretinitis may be present with canine distemper, systemic mycoses, protothecosis, toxoplasmosis, tuberculosis, bacterial septicemias, feline infectious peritonitis, thromboembolic meningoencephalitis, malignant catarrhal fever, classical swine fever, leptospirosis in horses, and onchocerciasis. Therapy is directed at the systemic disease.
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