Affiliation: | 1. University of Liverpool, Department of Immunology, PO Box 147, Liverpool L69 3BX;2. Beaufort Cottage Stables, High Street, Newmarket, Suffolk CB8 8JS Irish Equine Centre, Johnstown, Naas, Co Kildare, Ireland;3. Beaufort Cottage Stables, High Street, Newmarket, Suffolk CB8 8JS;4. Department of Veterinary Clinical Sciences, Veterinary Clinical Centre, University of Melbourne, Werribee, Victoria 3030, Australia |