Seroepidemiology of Maedi-Visna in Intensively Reared Dairy Sheep: A Two-Year Prospective Study

Isolation of Maedi/Visna Virus from a Sheep in Japan

Maedi/visna (MV) is a lentiviral disease of sheep caused by the maedi/visna virus (MVV). Although MV is prevalent in many countries, it had not been reported in Japan. In 2011, however, three sheep in northern Japan were reported to be seropositive against the MVV antigen, indicating a persistent MVV infection. In the present study, we isolated MVV from one sheep to confirm MVV infection and co...

Maedi-visna virus infection in sheep: a review.

The maedi-visna virus (MVV) is classified as a lentivirus of the retroviridae family. The genome of MVV includes three genes: gag, which encodes for group-specific antigens; pol, which encodes for reverse transcriptase, integrase, RNAse H, protease and dUTPase and env, the gene encoding for the surface glycoprotein responsible for receptor binding and entry of the virus into its host cell. In a...

Serological study of Maedi-Visna virus among sheep flocks in Kerman province of Iran

Outbreak of Maedi-Visna in Sheep and Goats in Palestine

Clinical and laboratory studies in an outbreak of Maedi-visna disease in a flock of sheep and goats were conducted. The clinical findings of the disease were loss of wool, dyspnea and coughing, progressive condition loss, exercise intolerance and chronic mastitis. Nervous signs were developed later and were characterized by gait abnormalities of the hind limbs, ataxia, tremor of facial muscles ...

Extensive rearing hinders Maedi-Visna Virus (MVV) infection in sheep.

Maedi-Visna Virus (MVV) seroprevalence and its relationship with housing and mode of rearing of replacement ewe-lambs was investigated in 38 non-randomly selected sheep-flocks in Spain. They included extensive lamb-producing Manchega cross-bred flocks raised almost permanently at pasture, semi-intensive Latxa dairy flocks housed 2-8 months/year and intensively raised Assaf dairy flocks housed m...