1. Immunization Unit, Robert Koch Institute, Berlin, Germany
2. NIHR Health Protection Research Unit in Emerging and Zoonotic Infections, Liverpool, United Kingdom
3. Virology and Pathogenesis Group, National Infection Service, Public Health England, Porton Down, United Kingdom
4. Medical Entomology Group, Emergency Response Department, Public Health England, Porton Down, United Kingdom
5. Tuberculosis, Acute Respiratory, Gastrointestinal, Emerging/Zoonotic Infections and Travel Health Division, National Infection Service, Public Health England, London, United Kingdom