1. Program of Comparative Medicine
2. Departments of Pathology
3. Epidemiology and Preventive Medicine, University of Maryland School of Medicine, Baltimore, Maryland, 21201; Departments of
4. Neurology
5. Division of Microbiology, Tulane National Primate Research Center, Covington, Louisiana 70433
6. Microbiology
7. Pathology, University of Colorado Health Sciences Center, Denver, Colorado 80262