Facepiece filtering respirators with exhalation valve should not be used in the community to limit SARS-CoV-2 diffusion

Affiliations

• ¹ Division of Anaesthesia, Analgesia, Intensive Care and Emergency, Department of Surgical, Oncological and Oral Science, Policlinico Paolo Giaccone, University of Palermo, Italy.
• ² Department of Anesthesia and Intensive Care, Policlinico Paolo Giaccone, University of Palermo, Palermo, Italy.
• ³ Dipartimento di Anestesia, Rianimazione ed Emergenza-Urgenza, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy.
• ⁴ Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy.