H R Dalton1, S Hazeldine2, M Banks3, S Ijaz4, R Bendall5. 1. Cornwall Gastrointestinal Unit, Royal Cornwall Hospital Trust, Truro TR1 3LJ, UK. Electronic address: harry.dalton@rcht.cornwall.nhs.uk. 2. Royal Devon and Exeter Hospital, Exeter, UK. 3. Veterinary Laboratories Agency, New Haw, Addlestone, UK. 4. Virus Reference Department, Centre for Infections, Health Protection Agency, London, UK. 5. Clinical Microbiology, Royal Cornwall Hospital Trust, Truro TR1 3LJ, UK.