1 Médecins Sans Frontières West and Central Africa, Marcory, Abidjan, Cote d'Ivoire; Institute for Innovation and Public Purpose, University College London, London, UK. Electronic address: e.torreele@ucl.ac.uk.
2 Epicentre, Yaoundé, Cameroon; Institut Pasteur Bangui, Bangui, Central African Republic; ISARIC Global Support Centre, International Severe Acute Respiratory and emerging Infection Consortium, Pandemic Sciences Institute, University of Oxford, Oxford, UK.
3 Médecins Sans Frontières West and Central Africa, Marcory, Abidjan, Cote d'Ivoire.