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55 Barton Street, Tewkesbury, Glos. GL20 5PX   .   01684 292177 (24hr)   .   coldicottvets@btconnect.com

Maedi Visna (MV)


Maedi Visna is a chronic disease, caused by a highly contagious virus. It is difficult to diagnose and is fatal. Diagnosis is via a blood test.

It can have huge economic impact on a flock through mortality, reduced lamb growth, increased culling, increased arthritis and infertility.

Affected lambs can have poor growth rates and increased mortality from reduced colostrum intake.  Clinical signs in sheep will not usually show until they are adults, due to long viral incubation, however once signs develop the condition is invariably fatal. Signs include wasting, pneumonia, mastitis, arthritis and progressive paralysis.

The virus is transmitted through milk, colostrum, faeces and respiratory secretions. This means both lambs and adult sheep can be affected by the disease.


Accreditation Scheme

Scotland’s Rural College (SRUC) offer a national scheme to all flock keepers to test for Maedi Visna in their sheep, with accreditation when no disease is found.

By joining the scheme, you are able to better protect your flock by identifying any disease earlier and eliminating problems.

Accreditation also brings further advantages such as:

-          Reducing the risk of MV virus in your flock

-          Attending shows and sales with accredited animals

-          Allows export to MV free countries

-          Advertising your flock as MV accredited, ultimately adding value

-          Enables you to sell to purchasers MV accredited flocks

To get MV accreditation the flock must pass two qualifying blood tests, between 6 and 12 months apart, and have certification from a vet that the holding can comply with the scheme’s rules and regulations

To maintain accreditation, any incoming animals form non-accredited flocks must be isolated and tested accordingly; and every 2 years some of the flock (dependent on size) is blood tested.


Please contact us if you wish to discuss this further, or arrange for your flock to gain accreditation.