1. School of Food Biosciences, University of Reading, Reading RG6 6AP
2. Laboratory of HealthCare Associated Infection, Centre for Infections, Health Protection Agency, Central Public Health Laboratory, London, NW9 5HT
3. National Collection of Type Cultures, Health Protection Agency, London, United Kingdom
4. Department of Clinical Microbiology, Royal Cornwall Hospital, Penventinnie Lane, Treliske, Truro, Cornwall TR1 3LQ