Johne`s disease caused by infection with Mycobacterium avium subspecies paratuberculosis affects New Zealand cattle, sheep, goats and deer. The disease is difficult to control because of the long incubation period, the long survival of the organism in the environment, shedding by apparently healthy but infected animals and the unreliability of diagnostic tests to detect subclinical or even clinical disease. A brief contrast with the approach to control in New Zealand and Australia is made
Proceedings of the New Zealand Society of Animal Production, Volume 62, Palmerston North, 282-283, 2002
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