Abstract
1Department of Oral Microbiology, London E1 2AD, and Joint Microbiological Research Unit, King's College School of Medicine and Dentistry, London SE5 9RW, United Kingdom
2Department of Medical Microbiology, London E1 2AD, and Joint Microbiological Research Unit, King's College School of Medicine and Dentistry, London SE5 9RW, United Kingdom
3St. Bartholomew's and The Royal London School of Medicine and Dentistry, London E1 2AD, and Joint Microbiological Research Unit, King's College School of Medicine and Dentistry, London SE5 9RW, United Kingdom