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Maedi Visna

Maedi Visna (MV) was first detected in Icelandic sheep flocks during 1954, before being introduced to the UK following the importation of infected sheep.  MV is caused by a retrovirus and is capable of having devastating effects on a flock, significantly reducing fertility and productivity. MV is a chronic wasting disorder, which is increasing in prevalence across UK flocks (recently doubling from 1.4-2.8%).  MV is ultimately a fatal condition, for which there is no vaccine available.  Flocks can be blood sampled to test for infection – with SRUC’s Premium Sheep and Goat Health Scheme also running an MV accreditation scheme.

Maedi Visna Factsheet


3 lambs grazing

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