1. FAO/WHO Collaborating Centre for Brucellosis, OIE Brucellosis Reference Centre, Animal and Plant Health Agency (APHA), Department of Bacteriology, Woodham Lane, Addlestone, Surrey KT15 3NB, UK
2. IDEXX Laboratories, , Grange House, Sandbeck Way, Wetherby LS22 7DN, UK
3. Lawrie Veterinary Group, 25 Griffiths Street, Falkirk FK1 5QY, UK