Reply to Abu Raya et al.

Eberhardt CS Center for Vaccinology and Neonatal Immunology, Department of Pediatrics and Pathology-Immunology Department of Neonatology and Pediatric Intensive Care, Children's Hospital of Geneva.
Martinez de Tejada B Department of Gynecology and Obstetrics.
Siegrist CA Center for Vaccinology and Neonatal Immunology, Department of Pediatrics and Pathology-Immunology Department of Pediatrics, Children's Hospital of Geneva, University Hospitals of Geneva and Faculty of Medicine, Switzerland.