Iowa State University Veterinarian Records, RS 22/6/0/9, University Archives, Special Collections Department, Iowa State University, http://www.add.lib.iastate.edu/spcl/arch/rgrp/22-6-0-9.html
Johne's disease (paratuberculosis) is a chronic infectious disease of cattle and it is occasionally found in sheep and goats. It is caused by a small rod-shaped acid-fast bacillus, Mycobacterium paratuberculosis which attacks the intestinal mucosa.
Iowa State University Veterinarian: Vol. 13
, Article 5.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol13/iss3/5