1 Materno-Fetal and Obstetrics Research Unit, Department "Femme-Mère-Enfant," University Hospital, 1011 Lausanne, Switzerland; Institute of Microbiology, Faculty of Biology and Medicine, University of Lausanne and University Hospital, Lausanne, Switzerland.
2 Pôle Femme Mère Enfant, Centre d'Investigation Clinique (INSERM CIC1410), UM 134 PIMIT "Processus Infectieux en Milieu Insulaire Tropical" (Université de La Réunion, CNRS 9192, INSERM U 1187, IRD 249), CHU Réunion, Saint Pierre, Réunion.
3 Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Columbia University Medical Center, New York, New York, USA.
4 Institute of Virology and Immunology, Department of Infectious Diseases and Pathobiology, University of Bern, Switzerland.
5 Unit of Emerging Infectious Diseases, Institut Louis Malardé, Tahiti, French Polynesia.
6 Swiss Tropical and Public Health Institute, Basel, Switzerland; Infectious Disease Service and Department of Ambulatory Care, University Hospital Lausanne, Lausanne, Switzerland.
7 Swiss Teratogen Information Service, University Hospital, 1011 Lausanne, Switzerland; Division of Clinical Pharmacology, University Hospital, 1011 Lausanne, Switzerland; School of Pharmaceutical Sciences, University of Geneva and Lausanne, Geneva, Switzerland; Department of Epidemiology, Harvard School of Public Health, Boston, MA, USA.