Abstract
Briefly the history of maedi–visna and the major clinical symptoms are described. Examples are presented to demonstrate that the genetic composition of a breed determines whether or not sheep become sick after an infection with maedi–visna virus (mvv) or develop solely specific antibodies. The major pathway of transmission is not colostrum and milk, but a cell containing increased nasal discharge in cases of respiratory distress. The role of the environment and prophylactic measures against parasites is stressed, because even sheep of highly susceptible breeds can survive an infection under optimal conditions. The virus and subsequently the disease simply die out. The cooperation between clinicians and laboratories is necessary.
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