1 Manson Unit, Médecins Sans Frontières UK, London EC4A 1AB, UK; Department of Infection, Imperial College London, London, UK. Electronic address: a.abbara15@ic.ac.uk.
2 Manson Unit, Médecins Sans Frontières UK, London EC4A 1AB, UK; Department of Global Health, London School of Hygiene & Tropical Medicine, London, UK.
3 Department of Medicine, Emory University School of Medicine, Emory University, Atlanta, GA, USA.
4 Epicentre, Médecins Sans Frontières, Yaoundé, Cameroon; Public Health Emergency Operation Centre, Ministry of Public Health, Yaoundé, Cameroon.
5 Department of Infection, Division of Infection and Immunity, University College London, London, UK; National Institute for Health and Care Research Biomedical Research Centre, University College London, London, UK.