1. Water, Health and Applied Microbiology Laboratory (WHAM Laboratory), Temple University, Philadelphia, Pennsylvania 19122, United States
2. College of Public Health, Temple University, Philadelphia, Pennsylvania 19122, United States
3. United States Geological Survey (USGS), Upper Midwest Water Science Center, Marshfield, Wisconsin 54449, United States
4. Department of Pediatrics, University of Washington, Seattle, Washington 98115, United States
5. United States Department of Agriculture (USDA), Agricultural Research Service, Marshfield, Wisconsin 54449, United States