Abstract
Paratuberculosis, or Johne’s disease, in cattle is caused by Mycobacterium avium subsp. paratuberculosis, which has recently been suspected to be transmitted through dust. This longitudinal study on eight commercial M. avium subsp. paratuberculosispositive dairy farms studied the relationship between the number of cows with M. avium subsp. paratuberculosis antibody-positive milk
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