1. Virus Reference Department, Microbiology Services, Health Protection Agency, London, United Kingdom.
2. MRC Centre for Medical Molecular Virology, Division of Infection and Immunity, University College London, London, United Kingdom.
3. AIDS Department, Victor Babes Hospital of Infectious and Tropical Diseases, Bucharest, Romania.
4. Immunology, Virology, and Molecular Biology Department, Victor Babes Hospital of Infectious and Tropical Diseases, Bucharest, Romania.
5. Hospital for Infectious Diseases, Constanta, Romania.
6. Matei Bals National Institute of Infectious Diseases, Bucharest, Romania.
7. AP-HP, Hôpital Louis Mourier, Service de Pédiatrie, Colombes, France.
8. Childrens Hospital of the Ludwig Maximilians University, Munich, Germany.
9. Medical University of Graz, Graz, Austria.