Affiliation: | aSchool of Life Sciences, University of Hertfordshire, College Lane, Hatfield, Herts AL10 9AB, UK;bTB Research group, Veterinary Laboratories Agency, Weybridge, Addlestone, Surrey KT15 3NB, UK;cDepartment of Pathology, Veterinary Laboratories Agency, Weybridge, Addlestone, Surrey KT15 3NB, UK |