Affiliation: | Divisions of Biologics;Biotechnology, PHLS Centre for Applied Microbiology and Research, Porton Down, Salisbury, Wiltshire, UK;Division of Bacteriology, United States Army Medical Research Institute of Infectious Diseases, Frederick, MD, USA;Defence Microbiology Division, Chemical and Biological Defence Establishment, Porton Down, Salisbury, Wiltshire, UK |