Abstract
1Houseman Ltd., The Priory, Burnham, Slough SL1 7LS, United Kingdom
2Division of Bacterial and Mycotic Diseases, National Center for Infectious Diseases, Centers for Disease Control, Atlanta, Georgia 30333
3Public Health Laboratory Service, Centre for Applied Microbiology and Research, Porton Down, Salisbury, United Kingdom
4Department of Virology, John Radcliffe Hospital, Oxford OX3 9DU, United Kingdom