Ordinary cloth masks cannot play an effective role in protecting against the new coronavirus infection. In addition, paper masks, cotton gauze masks, activated carbon masks, and sponge masks cannot be used in this epidemic. Because most of these masks are made of ordinary cotton, gauze, sponge or canvas, the material is not fine enough and the gaps are large enough to effectively block the virus. For the types of masks suitable for protection against the new coronavirus, the main types include medical surgical masks, medical protective masks, KN95 masks and N95 masks. If you can’t buy one, you can use a KN90 mask as a temporary substitute, but try not to crowded, poorly ventilated public places. In addition, the key to preventing infection is to isolate at home and try not to go out.