Wearing a mask is very important to prevent the transmission of novel coronavirus pneumonia. There are two types of masks that are recognized to be helpful in the transmission of the virus, one is surgical masks and the other is N95 masks. Surgical masks are masks used for surgery, so be careful not to wear the mask inside or outside. Because the outside blue side of this waterproof, white side of moisture absorption with a layer of filtration in the middle. If the mask is reversed, the droplets will be contaminated on the white side in the process of spreading and will not be able to prevent the spread of viruses and bacteria. The middle filter layer of general surgical masks can prevent about 90% or more of the particles with a diameter of about 5μm. Viruses can pass through the mask, but viruses cannot be spread in the air alone and are generally spread by attaching to droplets. Therefore, surgical masks can block large particle droplets, so they have a certain protective effect on the human body. n95 masks can block more than 95% of the transmission of particles of 0.3μm size. With N95 masks and divided into two categories, a class of anti-haze, and a class of anti-biological, and this time to choose anti-biological masks. In the application process of the mask inside and outside also can not be anti, general masks have a metal strip, the purpose of which is shaped, shaped in accordance with the shape of the nose, to prevent leakage of air. The mask is generally used 2-4 hours to replace 1 time, and does not advocate repeated use of the mask. Some studies have shown that it can be reused 3-5 times, but in the process of reuse, it should be noted that the outside of the mask may be contaminated with viruses, so the outside should be disinfected, such as disinfecting it with alcohol and then drying it out. Since alcohol evaporates quickly, when putting away the mask, fold it inside and keep it in an airtight, clean plastic bag. Content source: Dr. Yurai