How to choose a mask to prevent new pneumonia?


Overnight, new cases of coronavirus pneumonia occurred in Beijing and Guangzhou, with 136 new cases in Wuhan. Just as the news was announced, a case was diagnosed in Shenzhen. New cases of coronavirus infection have also been confirmed in Thailand and Japan.

In the case of no transmission source and transmission route, experts suggest that attention should be paid to cold protection, indoor ventilation and personal hygiene, strengthen physical exercise, maintain a light diet, and avoid activities in crowded places. Among them, it is very important to wear a mask.

But in the pharmacy, there are various masks. How can I choose to effectively protect against diseases?
These two masks are effective! Medical surgical masks and N95 masks

At present, cotton masks, paper masks, activated carbon masks, sponge masks, medical surgical masks and N95 masks are available in the market. But only medical surgical masks and N95 masks can play a role in preventing infectious diseases.

Medical surgical masks are generally used in high-demand environments such as medical clinics, laboratories, and operating rooms, and are masks worn by medical staff when working. The safety factor is relatively high, and the resistance to bacteria and viruses is strong. Medical surgical masks can also be used to prevent flu.

"Medical Surgical Mask" is (YY 0469-2011), and "Disposable Medical Mask" is (YY / T 0969-2013). YZB refers to the medical device enterprise registration standards, that is, the product standards formulated by the enterprise itself, which can be checked at the State Drug Administration.

It is understood that the medical surgical mask has three layers, from the outside to the inside are a waterproof layer, a filter layer, and a comfort layer. The comfort layer is a layer of non-woven fabric. When wearing, the white non-woven fabric faces inward, the blue waterproof layer faces outward, and the side with the metal sheet is facing up. Fit your nose and smooth your cheeks so that there is no gap between the mask and your face.

The higher level is the N95 mask that everyone says.

The N95 mask is one of nine anti-particulate masks certified by NIOSH (National Institute of Occupational Safety and Health). "N" means unsuitable for oily particles (oil fume produced by cooking is oily particles, and droplets produced by people speaking or coughing are not oily); "95" means filtering under the test conditions specified by the NIOSH standard The efficiency reaches 95%. N95 is not a specific product name. As long as the product meets the N95 standard and passes the NIOSH review, it can be called a "N95 mask".

The biggest feature of the N95 mask is that it can prevent droplet infection caused by a patient's body fluid or blood splash. The size of the droplets is 1 to 5 microns in diameter. The U.S. Occupational Safety and Health Administration (OSHA) requires medical institutions that medical workers exposed to tuberculosis bacteria must wear masks higher than N95.

Take coronavirus as an example (2019-nCoV is a kind of coronavirus), with an average diameter of about 100nm, that is,, plus a propagation vector, such as droplets of about 1-5um in diameter, and N95 filters 0.3um non-oily particles With an effect of ≥95%, N95 can achieve effective filtration.

It is worth noting that when choosing N95 masks, try to choose N95 masks without breathing valves. Analysis results show that N95 protective masks and medical surgical masks have no significant difference in the role of preventing infectious acute respiratory infections in clinical settings. But it also said that N95 masks are better closed.

So, how to wear N95 mask correctly? First, loosen the fixing band of the mask every 2-4cm; second, put on the mask and place the fixing band on the top of the head and behind the head respectively; then, press the metal strip on the side of the mask to make the mask fit your face shape; finally Check the tightness of the n95 mask and adjust it to the most comfortable state.

At present, medical personnel have put on N95 masks for protection.

Liang Jiansheng, a disease control expert in Wuhan, said that if people go to public places and do not come in contact with patients, wearing medical surgical masks is enough to avoid excessive protection, but if they will come in contact with patients, they should wear biological-proof N95 masks

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