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Caprine arthritis encephalitis is a viral disease of goats caused by a lentivirus called caprine arthritis encephalitis virus. The disease is found worldwide.

Two syndromes of CAE occur. Adult goats develop a chronic progressive arthritis, whereas young goats develop a neurological syndrome, with signs of paresis or paralysis. Less commonly, mastitis or pneumonia may occur.

Infection is life-long, and it may be years before signs of the disease occur. The reason for the long period of dormancy of the virus is not known.

In goats which develop arthritis, the joints become inflamed and swollen, and the goats will slowly lose condition. In some cases the goat will not be able to stand.

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