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Maedi Visna (MV) is a viral disease which was introduced into the UK through imported sheep approximately 20 years ago.  It is estimated that at least 100,000 sheep are now infected in the national flock.  MV is a chronic disease of sheep caused by a retrovirus.  The name derives from two Icelandic words which describe the main clinical signs of pneumonia and wasting.  The condition is highly contagious, difficult to diagnose and is fatal.

Economic Impact

• 10 - 20% adult mortality after development of clinical signs
• Lamb mortality and reduced growth rates
• Increase in culling rate
• Increased incidence of arthritis, premature birth and reduction in conception

Benefits of Joining the Scheme

• Helps reduce the risk of your flock contracting MV
• Gives membership of a nationally recognised health scheme
• Allows export to certain countries free from MV
• Gives added value to the flock
• Allows attendance at shows and sales from which animals would otherwise be banned

For more information about MV, please see the Quick Reference Guide on the right or contact the PSGHS office.