1. Microbiology and Virology Laboratory, ASST “Papa Giovanni XXIII”, 24127 Bergamo, Italy
2. Health Care Coordination Offices, ASST “Papa Giovanni XXIII”, 24127 Bergamo, Italy
3. Department of Health Care Professions, ASST “Papa Giovanni XXIII”, 24127 Bergamo, Italy
4. Technical Services, ASST “Papa Giovanni XXIII”, 24127 Bergamo, Italy
5. Sanipur S.p.A., 25020 Flero, Italy
6. ESCMID Study Group for Legionella Infections (ESGLI), 4001 Basel, Switzerland