1. Health Protection Agency, Microbiology Services Colindale, London, United Kingdom
2. Health Protection Agency, Health Protection Services Colindale, London, United Kingdom
3. Health Protection Agency, Microbiology Services Bristol, United Kingdom
4. Health Protection Agency, Microbiology Services Manchester, United Kingdom
5. Health Protection Scotland, Glasgow, United Kingdom
6. Public Health Wales Microbiology Cardiff, University Hospital of Wales, Cardiff, United Kingdom
7. West of Scotland Specialist Virology Centre, Glasgow, United Kingdom