1. National Institute for Infectious Diseases (INMI) “Lazzaro Spallanzani” Rome, Italy
2. Istituto Superiore di Sanità (ISS), National Centre for Epidemiology Surveillance and Health Promotion, Rome, Italy (CNESPS)
3. European Programme for Intervention Epidemiology Training (EPIET), European Centre for Disease Prevention and Control (ECDC), Stockholm, Sweden
4. Istituto Superiore di Sanità (ISS), Department of Infectious, Parasitic and Immune-mediated Diseases, Rome, Italy
5. European Centre for Disease Prevention and Control (ECDC), Stockholm, Sweden
6. Ministry of Health, Directorate General for Prevention, Rome, Italy
7. The members of the Central Task Force for the measles outbreak are listed at the end of the article