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
The campaign against bovine tuberculosis is not over. In military campaigns, when the conquering nation has the strength of the enemy greatly reduced, the war is over. In disease-control work this is not true. The small percentage of cattle left which harbor the infection can re-create the disease extensively in a very short time. Many livestock owners have entered the dairy industry since bovine tuberculosis has been brought under control. These men do not remember the old days when bovine tuberculosis was the No. 1 enemy of our dairy herds.
Moore, E. V.
"Bovine Tuberculosis Control In New York State,"
Iowa State University Veterinarian: Vol. 9
, Article 6.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol9/iss3/6