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
Sporadic outbreaks, of Spherophorus necrophorus infection in mink are quite commonly observed. One animal, several animals, or a large portion of a herd may be affected. A typical outbreak of this disease is that observed by Dr. J. A. Hunt, Winthrop, Iowa, in a group of mink from which specimens were submitted to the Iowa Veterinary Diagnostic Laboratory.
Monlux, William S. and Rhoades, Keith R.
"Spherophorus Necrophorus: Infection in Mink,"
Iowa State University Veterinarian: Vol. 23
, Article 6.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol23/iss3/6