1. Infectious Disease Aerobiology, Division of Microbiology, Tulane National Primate Research Center, Covington, Louisiana, USA.
2. Southwest National Primate Research Center, Texas Biomedical Research Institute, San Antonio, Texas, USA.
3. Lovelace Biomedical Research Institute, Albuquerque, New Mexico, USA.
4. Department of Microbiology and Immunology, Tulane School of Medicine, New Orleans, Louisiana, USA.