1 Institut Mondor de Recherche Biomédicale, Team Viruses, Hepatology, Cancer, Université Paris-Est, Créteil, France; Medical research Council Unit The Gambia at London School of Hygiene & Tropical Medicine, Disease Control & Elimination Theme, Fajara, The Gambia.
2 Medical research Council Unit The Gambia at London School of Hygiene & Tropical Medicine, Disease Control & Elimination Theme, Fajara, The Gambia.
3 Muhimbili National Hospital, Muhimbili, Tanzania.
4 Medical research Council Unit The Gambia at London School of Hygiene & Tropical Medicine, Disease Control & Elimination Theme, Fajara, The Gambia; St Mary's Hospital, Division of Digestive Diseases, Department of Metabolism, Digestion and Reproduction, Imperial College London, London SW7 2BX, UK.
5 Institut Pasteur, Unité d'Épidémiologie des Maladies Émergentes, Université Paris Cité, Paris, France.
6 Medical research Council Unit The Gambia at London School of Hygiene & Tropical Medicine, Disease Control & Elimination Theme, Fajara, The Gambia; St Mary's Hospital, Division of Digestive Diseases, Department of Metabolism, Digestion and Reproduction, Imperial College London, London SW7 2BX, UK. Electronic address: m.lemoine@imperial.ac.uk.