1. Area Rischio Infettivo, Agenzia Sanitaria e Sociale Regionale dell’Emilia-Romagna (Infectious risk area, Health and Social Regional Agency of Emilia-Romagna), Bologna, Italy
2. These authors contributed equally to this work
3. Infectious and Tropical Disease Unit, Istituti Ospitalieri di Cremona, Cremona, Italy
4. Dipartimento di Sanità Pubblica, Azienda Unitaria Sanitaria Locale (Department of Public Health, Local Health Agency), Ravenna, Italy