https://primapavia.it/cronaca/coronavirus-studio-del-san-matteo-rivela-in-lombardia-due-ceppi-diversi-del-virus/?utm_source=primapavia.it&utm_campaign=btn_social_share&utm_medium=btn_social_telegram
Coronavirus, studio del San Matteo rivela: "In Lombardia due ceppi diversi del virus"