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Carpenter, T. E., Gardner, I. A., Collins, M. T., & Whitlock, R. H. (2004). Effects of prevalence and testing by enzyme-linked immunosorbent assay and fecal culture on the risk of introduction of Mycobacterium avium subsp. paratuberculosis-infected cows into dairy herds. Journal Of Veterinary Diagnostic Investigation, 16(1), 31-38.