1. Northern Ireland Public Health Laboratory, Department of Bacteriology, Belfast City Hospital, Belfast, Northern Ireland
2. Department of Pathogenic Biology, Xian Jiactong University, Xi’an, Shaanxi Province, The People’s Republic of China
3. School of Biomedical Sciences, University of Ulster, Coleraine, Northern Ireland
4. Department of Medical Microbiology, Adelaide & Meath Hospital, Tallagh, Dublin 24, Ireland