After the new anti Covid measures launched by the government, the Ffp2 mask has known a greater diffusion in the population. But it is often not used correctly. “First of all, it must be worn in the right way, it must cover the nose and mouth tightly with the metal temple well attached to the nose. Then it must be changed after 6 hours of use, it must be placed in the sachet and manipulated as little as possible” he says to the Adnkronos Health Massimo Andreoni, head of infectious disease at the Tor Vergata Polyclinic in Rome and scientific director of the Italian Society of Infectious and Tropical Diseases (Simit). Andreoni takes stock of the correct use of the Ffp2 masks that have become mandatory for cinemas, theaters, sporting events, access to buses, trains and ships, and for people who have had close contact with a confirmed positive case at Covid and who, on the basis of the regulations in force, are not subject to quarantine, but only to self-monitoring. “Attention then if you are cold – warns Andreoni – In this case the mask deteriorates more quickly and therefore must be changed more often. The Ffp2 help to lower the risk of contagion and transmission, but it is advisable that they are not reused. They must be used. once and then change “.