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