1. Department of Medical Microbiology, School of Medicine, University of Manchester, Clinical Sciences Building, Manchester Royal Infirmary, Manchester M13 9WL, United Kingdom
2. Biological Sciences, University of Staffordshire, Stoke-on-Trent, United Kingdom
3. Health Protection Agency North West Laboratory, Clinical Sciences Building, Manchester Royal Infirmary, Manchester M13 9WZ, United Kingdom
4. Institute of Veterinary, Animal and Biomedical Sciences, College of Sciences, Massey University, Palmerston North, New Zealand
5. Epidemiology Group, Faculty of Veterinary Science, University of Liverpool, Neston CH64 7TE, United Kingdom
6. FEMS North West, Royal Preston Hospital, Sharoe Green Lane, Preston PR2 9HG, United Kingdom