Abstract
On August 3, 1940, trapping of the white-footed mouse, Peromyscus leucopus noveboracensis (Fischer), was begun both in the Des Moines River Valley in Boone County and in the woods surrounding Iowa State College in Story County. These mice were to be used as experimental hosts for rodent warble infection. From the date trapping commenced until November 2, 1940, several mice were found in the live traps either dead or wavering on their feet. Others died after being in captivity from two to five days. This condition led to the following investigation.
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