Disease Dynamics Unit (DDU), Department of Veterinary Medicine, University of Cambridge, Cambridge, United Kingdom.|Disease Dynamics Unit (DDU), Department of Veterinary Medicine, University of Cambridge, Cambridge, United Kingdom.|Disease Dynamics Unit (DDU), Department of Veterinary Medicine, University of Cambridge, Cambridge, United Kingdom.|Data Systems Group, Animal & Plant Health Agency Weybridge, New Haw, Addlestone, Surrey, United Kingdom.|Department of Bacteriology (TB Research), Animal & Plant Health Agency Weybridge, New Haw, Addlestone, Surrey, United Kingdom.|Department of Bacteriology (TB Research), Animal & Plant Health Agency Weybridge, New Haw, Addlestone, Surrey, United Kingdom.|Disease Dynamics Unit (DDU), Department of Veterinary Medicine, University of Cambridge, Cambridge, United Kingdom.