1 Unit of Emerging Infectious Diseases, Institut Louis Malardé, PO Box 30, 98713 Papeete, Tahiti, French Polynesia. Electronic address: dmusso@ilm.pf.
2 Materno-Fetal and Obstetrics Research Unit, Department Femme-Mère-Enfant, Maternity, University Hospital, Lausanne, Switzerland; Institute of Microbiology, Faculty of Biology and Medicine, University of Lausanne and University Hospital, Lausanne, Switzerland.