Professor Mike Taylor is head of Veterinary Surveillance at the Central Science Laboratory York, UK. He is also a visiting Professor of Parasitology at the Royal Veterinary College, London and at the University of Wales, Bangor, an Honorary Fellow of the University of Edinburgh, as well as a Diplomate of the European College of Veterinary Parasitology, and Editor-in-Chief of Veterinary Parasitology. Dr Bob Coop was formerly Head of the Division of Parasitology at the Moredun Research Institute, Scotland, and is now Honorary Fellow of the Moredun Foundation. He has over 35 years' experience of research in veterinary parasitology. Richard Wall is Professor of Zoology at the University of Bristol, UK, where he teaches and heads an internationally recognized research group working on the ecology, behaviour and control of arthropod parasites and vectors. He has served as veterinary editor of the journal Medical & Veterinary Entomology and President of the British Association for Veterinary Parasitolgy; he is a Fellow of the Royal Entomological Society.