1. Institute for Animal HealthAsh Road, Pirbright, Surrey GU24 0NF, UK
2. Division of Environmental and Evolutionary Biology, University of GlasgowGlasgow G12 8QQ, UK
3. Met OfficeFitzroy Road, Exeter EX1 3PB, UK
4. Animal Health Divisional Office, Strathearn HouseBroxden Business Park, Lamberkine Drive, Perth PH1 1RZ, UK