Of 42 Microtus pennsylvanicus trapped 1 km from Bozeman, Montana, 14 (33.3 percent) were infected by strobilocerci of Taenia taeniaeformis, while only one (2.1 percent) of 47 was infected at a rural site 16 km from Bozeman. The higher incidence of the primary host, domestic cats, is believed to account for the higher rate of infection near Bozeman.
McBee, Richard H. Jr.
"Varying prevalence of Taenia taeniaeformis strobilocerci in Microtus pennsylvanicus of Montana,"
Great Basin Naturalist: Vol. 37
, Article 8.
Available at: http://scholarsarchive.byu.edu/gbn/vol37/iss2/8