L. L. Keller, C. D. Harrell, S. M. Loerzel, and D. O. Rae, “Johne’s disease: Seroprevalence of Mycobacterium avium subspecies paratuberculosis in Florida beef and dairy cattle”., Bov. pract., vol. 38, no. 2, pp. 135–141, Jun. 2004.