1. 215 Pasteur Hall, Winona State University, Winona, Minnesota 55987, USA
2. Missouri Department of Conservation Research Center, 1110 S. College Ave, Columbia, Missouri 65201, USA
3. Merial Limited, Missouri Research Center, 6498 Jade Road, Fulton, Missouri 65251, USA
4. Department of Pathobiology, 201 Connaway Hall, University of Missouri–Columbia, Columbia, Missouri 65211, USA