visna virus

(redirected from Maedi-visna virus)
Also found in: Acronyms.

vis·na vi·rus

an RNA virus a Lentivirus (family Retroviridae) that causes visna; it is closely related antigenically to the similar maedi virus.
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The most common causes for viral encephalitis in sheep include maedi-visna virus, Borna disease virus, and rabies virus.
Indication of cross-species transmission of astrovirus associated with encephalitis in sheep and cattle

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