1. Institut Pasteur, French National Reference Center and WHO Collaborating Center Listeria, Paris, France
2. Necker-Enfants Malades University Hospital, Division of Infectious Diseases and Tropical Medicine, Assistance Publique-Hôpitaux de Paris, Institut Imagine, Paris, France
3. Institut Pasteur, Université de Paris, Inserm U1117, Biology of Infection Unit, Paris, France
4. Department of Anatomopathology, Paris Centre University Hospital, Paris, France
5. Paris Centre University Hospitals, Department of Infectious Diseases and Tropical Medicine, Institut Imagine, Paris, France