1. La Jolla Institute for Immunology, La Jolla, CA 92037, USA.
2. NIHR and CRUK Southampton Experimental Cancer Medicine Center, Faculty of Medicine, University of Southampton, Southampton, UK.
3. Southampton Specialist Virology Centre, Department of Infection, University Hospital Southampton NHS Foundation Trust, Southampton, UK.
4. Liverpool Head and Neck Center, Institute of Translational Medicine, University of Liverpool and Clatterbridge Cancer Center NHS Foundation Trust, Liverpool, UK.
5. Department of Medicine, University of California San Diego, La Jolla, CA 92037, USA.