Abstract
1Department of Medical Microbiology, Southmead Health Services NHS Trust, Bristol BS10 5NB, United Kingdom
2Department of Microbiology, Institute of Food Research, Reading RG6 6BZ, United Kingdom
3Department of Oral Microbiology, St. Bartholomew's and the Royal London School of Medicine and Dentistry, London E1 2AD, United Kingdom
4Public Health Laboratory, University Hospital of Wales, Cardiff CF4 4XW, United Kingdom