Prevalence of Cryptosporidium sp. in peak density Microtus agrestis, Microtus oeconomus and Clethrionomys glareolus populations.

The prevalence of cryptosporidia was determined in high density populations of Microtus agrestis, Microtus oeconomus, and Clethrionomys glareolus in Finland. One of 131 M. Agrestis and one of 41 C. glareolus each were found to be infected with Cryptosporidium sp.; none were found in 43 Microtus oeconomus. These apparently healthy voles had neither signs of clinical disease nor histopathological changes in intestines.