1. Department of Infection Biology; Institute of Infection and Global Health; School of Veterinary Science; University of Liverpool; Liverpool Science Park IC2, 146 Brownlow Hill Liverpool L3 5RF UK
2. Wood Veterinary Group; 125 Bristol Road Quedgeley Gloucester Gloucestershire GL2 4NB UK
3. Farm Animal Health and Production Group; The Royal Veterinary College; Hawkshead Lane North Mymms Hatfield Hertfordshire AL9 7TA UK