1 Health Agency of Tuscany, 50141 Firenze, Italy; Department of Experimental and Clinical Medicine, University of Florence, Firenze, Italy. Electronic address: cristina.stasi@gmail.com.
2 Health Agency of Tuscany, 50141 Firenze, Italy.
3 Laboratory Unit, Health District of Prato, Prato, Italy.
4 Infectious Disease Unit, Health District of Prato, Prato, Italy.
5 Epidemiological Unit, Health District of Prato, Prato, Italy.