[1] Hlth Protect Agcy, Campylobacter Reference Unit, Lab Enter Pathogens, Specialist & Reference Microbiol Div, London NW9 5HT, England
[2] Manchester Royal Infirm, Manchester Med Microbiol Partnership, Hlth Protect Agcy, NW Lab, Manchester M13 9WL, Lancs, England
[3] Welsh Assembly Govt, Cardiff, S Glam, Wales