1. Virology Division, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Maryland.
2. Department of Pathobiological Sciences, Louisiana State University, School of Veterinary Medicine, Baton Rouge, Louisiana.
3. Department of Molecular and Cellular Biology, Tulane University, New Orleans, Louisiana.
4. Diagnostics Systems Division, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Maryland.