1 Materno-fetal and Obstetrics Research Unit, Obstetric Service, Department Woman-Mother-Child, Lausanne University Hospital, Lausanne 1011, Switzerland.
2 Unit of Emerging Infectious Diseases, Institut Louis Malardé, Tahiti, French Polynesia; Aix Marseille Univ, IRD, AP-HM, SSA, VITROME, IHU-Méditerranée Infection, Marseille, France.
3 Center of Tropical Medicine and Travel Medicine, Department of Infectious Diseases, Division of Internal Medicine, Academic Medical Center, University of Amsterdam, Amsterdam, Netherlands.
4 Division of Infectious Diseases, William C Gorgas Center for Geographic Medicine, University of Alabama at Birmingham, Birmingham, AL, USA.
5 Materno-fetal and Obstetrics Research Unit, Obstetric Service, Department Woman-Mother-Child, Lausanne University Hospital, Lausanne 1011, Switzerland. Electronic address: david.baud@chuv.ch.