1. Virus Reference Department, Public Health England, London, United Kingdom
2. Immunisation and Countermeasures Division, Public Health England, London, United Kingdom
3. Microbiology Services Laboratory, NHS Blood and Transplant, Bristol, United Kingdom
4. East London NHS Foundation Trust, London, United Kingdom
5. Derbyshire Healthcare NHS Foundation Trust, Derby, United Kingdom
6. Manchester University NHS Foundation Trust, Manchester, United Kingdom
7. Birmingham Community Healthcare NHS Trust, Aston, United Kingdom
8. Oxford University Hospitals NHS Foundation Trust, Oxford, United Kingdom
9. University of Oxford, Oxford, United Kingdom
10. Fundação Oswaldo Cruz-Fiocruz, Instituto Oswaldo Cruz, Laboratório de Vírus Respiratórios e do Sarampo, Rio de Janeiro, Rio de Janeiro, Brasil
11. Paediatric Infectious Diseases Research Group, St. George’s University of London, London, United Kingdom