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Paratuberculosis (Johne’s disease) in ruminants is caused by Mycobacterium avium subsp. paratuberculosis (MAP). Owing to the lack of accurate laboratory tests, diagnosis is challenging in subclinically infected cattle. To evaluate the long‐term performance of serum ELISAs for the detection of paratuberculosis in a dairy herd with low MAP‐prevalence, three investigations of all the cows and the consecutive...
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