Claudia Estcourt, MBBS, MD1, Lorna Sutcliffe, MSc2, Cath Mercer, BSc, MSc, PhD3, Andrew Copas, BA, MSc, PhD4, Pamela Muniia, MSc5, Greta Rait, MSc, MD5, Merle Symonds, Dip HE6, Laura Greaves, BSC, MSc7, Kazeem Aderogba, MBChB8, Donal Traynor, Esq8, Tracy Roberts, PhD9, Louise Jackson, PhD9, Anne Johnson, MBBS, MD10, Sarah Creighton, MBBS BSc11, Geoff Huckle, Esq11 and Jackie Cassell, BMBCh, MSc, MD, BA (Philosophy)12, 1Centre 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, 2Queen Mary University of London, 3Department of Infection and Population Health, University College London, London, United Kingdom, 4Department of Infection and Population Health, Centre for Sexual Health and HIV Research, London, United Kingdom, 5University College London, 6Infection & Immunity, Barts Health NHS Trust, LONDON, United Kingdom, 7Barts Health NHS Trust, 8East Sussex Healthcare Trust, 9University of Birmingham, 10Research Department of Infection and Population Health, University College London, London, United Kingdom, 11Homerton University Hospital NHS Foundation Trust, 12Brighton & Sussex Medical School