Richard Goering, BA MSc PhD, Professor and Chair, Department of Medical Microbiology and Immunology, Creighton University School of Medicine, Omaha, Nebraska., Hazel M. Dockrell, BA (Mod) PhD, Professor of Immunology, Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, UK, Mark Zuckerman, BSc(Hons), MBBS, MRCP, MSc, FRCPath, Consultant Virologist and Honorary Senior Lecturer, South London Specialist Virology Centre, King’s College Hospital NHS Foundation Trust, King’s College London School of Medicine, London, UK and Peter L. Chiodini, BSc, MBBS, PhD, FRCP, FRCPath, FFTM, RCPS(Glas), Consultant Parasitologist, Hospital for Tropical Diseases, London; Honorary Professor, London School of Hygiene and Tropical Medicine, London, UK