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Kalis, C. H., Hesselink, J. W., Russchen, E. W., Barkema, H. W., Collins, M. T., & Visser, I. J. (1999). Factors influencing the isolation of Mycobacterium avium subsp. paratuberculosis from bovine fecal samples. Journal Of Veterinary Diagnostic Investigation: Official Publication Of The American Association Of Veterinary Laboratory Diagnosticians, Inc, 11(4), 345-351.