1. Department
of Microbiology, University of Texas Southwestern Medical Center,
Dallas, Texas 75390-9048
2. Departments of
Medicine and Molecular Microbiology, Washington University
School of Medicine, St. Louis, Missouri
63110
3. Texas Veterinary Medical Diagnostic
Laboratory, Amarillo, Texas 79116-3200
4. Department of
Pathology, University of Texas Medical Branch, Galveston,
Texas 77555-0436