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
Swine dysentery is a mucohemorrhagic, exudative disease with lesions confined to the large intestine of pigs. Estimates from a 1976 survey by the Livestock Conservation Institute indicate an 88% increase in incidence of the disease in the United States since a similar 1972 estimate. This approximates a total annual loss of $64 million to the swine industry.
Schwartz, K. J. and Glock, R. D.
"Swine Dysentery - A Practitioner Update,"
Iowa State University Veterinarian: Vol. 38
, Article 2.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol38/iss3/2