1. Department of Agriculture for Northern Ireland; Veterinary Sciences Division; Stoney Road, Stormont Belfast BT4 3SD
2. Department of Agriculture for Northern Ireland; Divisional Veterinary Office; Robert Street Newtownards BT23 4DN
3. AgResearch; Wallaceville Upper Hutt New Zealand
4. Department of TB Immunology; Statens Seruminstitut Copenhagen S Denmark