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  • Title: Optic neuropathy in sheep associated with overdosage of closantel.
    Author: Borges AS, Mendes LC, de Andrade AL, Machado GF, Peiro JR.
    Journal: Vet Hum Toxicol; 1999 Dec; 41(6):378-80. PubMed ID: 10592945.
    Abstract:
    This report describes clinical and pathological findings in 2 flocks in Brazil where blindness and deaths in sheep occurred after closantel overdosage. Depression, weakness, and blindness affected 37 animals and 17 died in 2 flocks of 190 animals. Two animals submitted for ophthalmic examination showed no inflammation in the anterior segment of both eyes; posterior segment evaluation by indirect ophthalmoscopy suggested retinal degeneration. One postmortem evaluation local spongy vacuolization was in several regions of the brain and the optical nerves had severe axonal degeneration.
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