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Maedi-visna virus infection in rams in Nova Scotia.

Introduction In 1971, formalin-fixed lung tissue from a five year old Dorset X Leicester ewe suspected of having progressive interstitial pneumonia was forwarded to this laboratory from Rock Forest, Quebec (R. Bellavance, Personal Cummunication). Histopathological examination confirmed the tentative diagnosis of chronic interstitial pneumonia resembling Montana progressive pneumonia (12). Bellavance and Phaneuf (2) and Bellavance et al (3) subsequently reported the presence of serum neutralizing antibody titres to maedi-visna virus of up to 1:128 in adult sheep from the affected flock in Quebec. This report describes two cases of chronic interstitial pneumonia and encephalomyelitis in rams which had originally come from the same flock as those reported by Bellavance et al (3).