1. U.S. Department of Agriculture−Agricultural Research Service (USDA−ARS), Environmentally Integrated Dairy Management Research Unit, 2615 Yellowstone Drive, Marshfield, Wisconsin 54449, United States
2. Laboratory for Infectious Disease and the Environment (An Interagency Laboratory Supported By USDA-ARS and the U.S. Geological
Survey), 2615 Yellowstone Drive, Marshfield, Wisconsin 54449, United States
3. U.S. Geological Survey, Upper Midwest Water Science Center, 2615 Yellowstone Drive, Marshfield, Wisconsin 54449, United States
4. Minnesota Department of Health, P.O. Box 64975, St. Paul, Minnesota 55164, United States