1. Ecosystems Research Division, United States Environmental Protection Agency, 960
College Station Road, Athens, Georgia 30605, United States
2. The Dow Chemical Company, Midland, Michigan 48667, United States
3. Centers for Disease Control and Prevention, National Center for Emerging and Zoonotic Infectious Diseases, Waterborne Disease Prevention Branch,
1600 Clifton Road, Atlanta, Georgia 30329, United States