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Borna disease, also known as sad horse disease, is an infectious neurological syndrome of warm-blooded animals, caused by Borna disease viruses 1 and 2 (BoDV-1/2). BoDV-1/2 are neurotropic viruses of the species Orthobornavirus bornaense, and members of the Bornaviridae family within the Mononegavirales order.
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