According to the "New Coronavirus Pneumonia Diagnosis and Treatment Plan (Trial Version 4)" issued by the National Health Commission on January 28, 2020, it is clear that the source of infection currently seen is mainly patients with pneumonia infected by the new coronavirus. The mode of transmission is mainly through respiratory droplets, but also through contact. (Keypoints) In other words, contact with body fluids splashed by an infected person's cough or sneeze, or shaking hands with an infected person may cause infection; if your hand touches something the infected person has touched, and then touch your own mouth, nose, or eyes may also spread the virus.
Under normal circumstances, every time we sneeze, we will spray more than 40,000 small drops, each of which contains a large number of viruses and bacteria, which can spread to 3~8 meters away at a speed of up to 35 meters per second. Some small droplets can even stay in the air for a long time, which makes it even spread to the ceiling or another subway car.
Winter is the season of the high incidence of respiratory infectious diseases. The current overseas epidemic situation continues to spread, and imported new coronary pneumonia confirmed cases occur from time to time. If a mask is worn according to the standard, a general surgical mask cannot exceed 4 hours, and the wearing time of N95 masks cannot exceed 8 hours. It should be destroyed after use. However, the environment we are currently exposed to is relatively simple and healthy. You can appropriately extend the time and frequency of wearing masks according to the following precautions.
1. If you go out a day for a short time, and you have fewer environmental personnel or have better air circulation during outdoor activities, and the possibility of exposure to the virus is relatively small, then a general medical surgical mask can be used several times, as much as possible. Possible savings, but it is not recommended to wear it for more than a week, or the cumulative time exceeds 8 hours.
2. If you go to a virus-intensive place such as a hospital, you must destroy it immediately after 4 hours of use. Because the mask may be full of viruses, it is extremely unsafe to wear it again.
3. If it is a daily commute, 2 hours a day, and public transportation, wearing N95 masks can be used for a week, and some high-efficiency protective masks can be used for up to 100 hours. But remember to use it again after disinfection after every use, and don't touch the air valve and the nose and mouth area, and store it in a sealed bag after disinfection.
When there is no sufficient supply of masks, N95 masks can be worn for at least 3 days as long as they are not obviously soiled or damaged (such as creases or tears).
Studies have shown that the filtration efficiency of N95 masks remains above 95% when worn for 2 days, and the filtration efficiency is reduced to 94.7% for 3 days.
The information is provided by the N95 masks supplier.