1. Section of Infectious Diseases and Immunity, Department of Medicine, and
2. Section of Respiratory Infections, National Heart and Lung Institute, Imperial College London, London, United Kingdom
3. Mucosis B.V., represented by trustee Mr. Holtz, LLM, Bout Advocaten, Groningen, and Virtuvax B.V., Groningen, the Netherlands; and
4. Department of Clinical Infection, Microbiology, and Immunology, University of Liverpool, Liverpool, United Kingdom