1. Department of Pathology and Microbiology, College of Medicine, University of Nebraska Medical Center, Omaha
2. Nebraska Public Health Laboratory, Omaha
3. Department of Internal Medicine, Division of Infectious Diseases, University of Nebraska Medical Center, Omaha
4. Department of Psychiatry, College of Medicine, University of Nebraska Medical Center, Omaha
5. Department of Anesthesiology, Division of Critical Care, University of Nebraska Medical Center, Omaha
6. Department of Environmental, Agricultural, and Occupational Health, College of Public Health, University of Nebraska Medical Center, Omaha.