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
Using adaptability to hosts and historical implications as criteria, Trichinella spiralis must be one of the oldest of disease producing organisms. Development of adaptability to hosts by parasitic agent is regarded as a slow, evolving process. Natural host records for trichinae have been reported for over 100 species, with probably all mammals being susceptible to infection with this parasite.
Zimmermann, W. J.
"The Trichiniasis Problem: Facts, Fallacies, and Future,"
Iowa State University Veterinarian: Vol. 33
, Article 13.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol33/iss2/13