1. Department of Biosciences, University of Durham, South Road, Durham, DH1 3LE, U.K.
2. School of Infection and Immunity, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow G12 8TA, U.K.
3. Departamento de Bioquímica e Imunologia, Universidade Federal de Minas Gerais, Caixa Postal 486 31270-901, Belo Horizonte, Minas Gerais, Brazil
4. York Biomedical Research Institute, Hull York Medical School, University of York, York YO10 5NG, U.K.
5. School of Life Sciences, Keele University, Staffordshire, ST5 5BG, U.K.
6. Département de Pathologie et Microbiologie, Faculté de Médecine Vétérinaire, Université de Montréal, Saint-Hyacinthe, Quebec J2S 2M2, Canada
7. Département de Biomédecine, Faculté de Médecine Vétérinaire, Université de Montréal, Saint-Hyacinthe, Quebec J2S 2M2, Canada