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
Foot-rot has been a serious problem in the cattle population of southwestern Wisconsin. It lacks seasonal occurence as it is found extensively the year around. It has not been studied in the light of determining the etiology, but it is suspected that Actinomyces necrophorus is involved in the majority of these infections. The symptomatology is similar to that of cases reported in other regions where this organism has been isolated.
Cooper, Carlos M.
"Massive Doses of Sulfones For Treatment of Foot-Rot,"
Iowa State University Veterinarian: Vol. 11
, Article 3.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol11/iss1/3