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
On Aug. 17, 1953, a three-year-old Shorthorn cow was admitted to Stange Memorial Clinic with a history of a chronic intestinal disorder. There had been other animals with the same symptoms in the neighborhood, and a creek which ran through the pasture where this cow grazed also ran through several other neighboring pastures.
"Paratuberculosis in a Bovine,"
Iowa State University Veterinarian: Vol. 16
, Article 12.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol16/iss1/12