1 Alder Hey Children's NHS Foundation Trust, Liverpool, UK; paediatric lead, NHS England High Consequence Infectious Diseases (Airborne) Network.
2 University of Southampton, Southampton, UK; consultant in paediatric immunology and infectious diseases, University Hospital Southampton NHS Foundation Trust, Southampton, UK.
3 Imperial College, London, UK; convenor, British Paediatric Allergy, Immunity and Infection Group.