1. National Infection Service, Public Health England, London, United Kingdom
2. Immunisation, Hepatitis and Blood Safety Department, National Infection Service, Public Health England, London, United Kingdom
3. Communicable Disease Surveillance Centre and Vaccine Preventable Disease Programme, Public Health Wales, Cardiff, United Kingdom
4. Public Health England South West, Public Health England, Exeter, United Kingdom
5. Virus Reference Department, National Infection Service, Public Health England, London, United Kingdom