Jo Gibbs, MBChB, MSc1, Lorna Sutcliffe, MSc2, Richard E Ashcroft, MA, PhD2, Pam Sonnenberg, MB BCh, MSc, PhD3, S Tariq Sadiq, BM, MSc, MD4 and Claudia Estcourt, MBBS, MD5, 1Centre for Immunology & Infectious Disease, Blizard Institute, Queen Mary University of London, London, United Kingdom, 2Queen Mary University of London, 3Department of Infection and Population Health, University College London, London, United Kingdom, 4St George's University of London, 5Centre for Immunology & Infectious Disease Blizard Institute Barts & The London School of Medicine & Dentistry, Queen Mary University of London & Barts Health NHS Trust, London, United Kingdom