1. Tulane National Primate Research Center, Tulane University Health Sciences Center, Covington, Louisiana;
2. Southwest National Primate Research Center, Texas Biomedical Research Institute, San Antonio, Texas;
3. Department of Molecular Microbiology, Washington University in St. Louis School of Medicine, St. Louis, Missouri;
4. Department of Microbiology and Immunology, Tulane University School of Medicine, New Orleans, Louisiana; and
5. Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan