Why wear a mask? Coronavirus spreads from person to person, usually when someone comes into contact with the secretions of an infected person. The infectivity of the virus directly affects the route of transmission. The current spread of the novel coronavirus is not yet clear, but according to past experience, contact with body fluids from coughing or sneezing or shaking hands with an infected person may cause infection. If you touch something that an infected person has touched with your hand, and then touch your own mouth, nose, or eyes, you can also spread the virus. Under normal circumstances, there is about 1 liter of liquid in a person’s lungs. Every time you sneeze, your lungs will spray this liquid into a mist like a squeezed mineral water bottle. When outside the body, they will be divided into more than 40,000 small drops, each of which contains a large number of viruses and bacteria. Due to the huge thrust in the body, the speed of these liquids can reach as high as 35 meters per second and the propagation distance can reach 3 to 8 meters. Come, this picture is more intuitive. The reason why SARS was so terrible in 2003 is that it spreads through droplets at a speed that is difficult for people to control. Southeast Asia flu on Monday will reach southern China the next Monday, and it will spread throughout the country next Monday. So you must wear a copper mask
!!! Even if you are in contact with an infected person, wearing a mask can prevent you from directly inhaling the virus in the droplets. Be sure to wash your hands frequently!!! Even if the virus is left on your hands, washing your hands can block the virus from entering the body through your hands. Is there a difference between KN95 and N95? N95 masks are actually respirators. Respirators are a kind of respiratory protection equipment. Compared with ordinary masks, they fit the face tightly and can filter the air very effectively. particulates. Among them, N means Not resistant to oil, which can be used to protect non-oily suspended particles; 95 means that the filtration efficiency is greater than or equal to 95%, indicating that after careful testing, this respirator can block at least 95% of very small (0.3 Micron level) test particles. From the design, if it is ranked according to the priority of the wearer's own protective ability (from high to low): N95 masks>surgical masks>ordinary medical masks>ordinary cotton masks. If worn correctly, the filtering capacity of N95 is better than ordinary masks and medical masks. However, even if it is worn in full compliance with the requirements, the risk of infection or death cannot be eliminated 100%. KN95 is one of the levels specified in the Chinese standard GB2626-2006. N95 is one of the levels specified in the American standard 42 CFR 84. The technical requirements and test methods of these two levels are basically the same, and the filtration efficiency reaches 95% under the corresponding standards. How long can KN95 masks be used? At present, foreign countries, including WHO, have no clear conclusions on the best wearing time of N95 masks, and my country has not yet made relevant regulations on the use time of masks. Some researchers have done relevant research on the protection efficiency and wearing time of N95 medical protective masks. The results show that the filtration efficiency of N95 masks remains above 95% when worn for 2 days, and the respiratory resistance does not change much; the filtration efficiency is reduced to 94.7 after wearing for 3 days. %. The US CDC’s recommendation is that if there is no sufficient supply of masks, as long as the equipment is not obviously soiled or damaged (such as creases or tears), it can be considered for reuse. Masks are not omnipotent, but wearing masks correctly and frequently washing and disinfecting your hands can greatly reduce the chance of being infected! If you are a virus carrier, please use N95 without an exhalation valve. Don’t spread the virus on! Wear a copper mask
+ wash your hands frequently Reduce going out, don't go to crowded places, do a good job of epidemic prevention work and do not slack, I hope everyone is safe and healthy!
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