1. Laboratory of Molecular Biology, School of Environmental Health Sciences, Azabu University, Sagamihara 252-5201, Japan
2. AFSSA, Laboratoire d'Etudes et de Recherches en Pathologie Equine, IPC, Goustranville 14430, France
3. Centre for Infection and Immunity, Queen's University, Belfast BT9 7AB, UK
4. Department of Bacteriology, Belfast City Hospital, Lisburn Road, Belfast BT9 7AD, UK