1. Division of Parasitic Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, U.S. Department of Health and Human Services; Atlanta GA 30341
2. Center for Food Safety and Quality Enhancement; University of Georgia; 1109 Experiment Street Griffin GA 30223
3. Environmental Microbial Safety Laboratory, Animal and Natural Resources Institute, Agricultural Research Service, U.S. Department of Agriculture; Beltsville MD 20705