1. These authors contributed equally to this work
2. Enteric Virus Unit, National Infection Service Laboratories, Public Health England, London, United Kingdom
3. Gastrointestinal Pathogens Unit, National Infection Service Laboratories, Public Health England, London, United Kingdom
4. High Containment Microbiology, National Infection Service Laboratories, Public Health England, London, United Kingdom
5. Immunisations and Countermeasures, National Infection Service, Public Health England, London, United Kingdom