1. Health Protection Agency, Centre for Infections, London, United Kingdom.
2. Veterinary Laboratories Agency, Department of Food and Environmental Safety, Addlestone, Surrey, United Kingdom.
3. Statens Serum Institut, Department of Bacteriology, Mycology and Parasitology and Department of Epidemiology, Copenhagen, Denmark.
4. European Food Safety Authority (EFSA), Scientific Panel on Biological Hazards, Parma, Italy.