Abstract
1 SAC Veterinary Services, Drummondhill, Stratherrick Road, Inverness IV2 4JZ, UK
2 Laboratory of Healthcare Associated Infection, Centre for Infections, Health Protection Agency, London NW9 5HT, UK
3 Department of Botany and Microbiology, University of Oklahoma, Norman, OK 73019-0245, USA
4 Institute of Zoology, Regent's Park, London NW1 4RY, UK
5 School of Food Biosciences, University of Reading, Reading RG6 6AP, UK