Can wearing a mask effectively prevent novel coronavirus?

If two people wear masks, even if one of them is a patient, the probability of infection will be very low compared with two people who don't wear masks or only one person wears masks. As early as the early stage of the epidemic, Academician Zhong Nanshan made it clear that wearing masks can effectively prevent novel coronavirus, because the main modes of transmission in novel coronavirus are droplet transmission, aerosol transmission and contact transmission.

If two people wear masks, it can effectively block the transmission route of the virus, because generally speaking, novel coronavirus is mainly transmitted by respiratory droplets, which means that droplets will be produced in our daily conversation, coughing and sneezing. Unless obvious drops of water spray on your face, do you feel the way this man talks and drool on my face? Note that many times you can't feel the spread of droplets. If you don't have protective measures, the person opposite is infected in COVID-19, so a large number of pathogens can be emitted into the air through his droplets. You happen to be very close to him and unfortunately live on your respiratory mucosa. The pathogen (novel coronavirus) lurks here. A few days later, the incubation period has passed, and you have a fever, cough, sore throat and runny nose. It's quite possible. Therefore, when people wear masks, they should also keep a distance of more than 1 meter, especially when talking face to face. People suspected of having infectious diseases should be isolated as soon as possible.

Second, aerosol transmission. When patients sneeze, cough and talk, droplets float in the air and large particles will be deposited. Particles smaller than 2.5pm in diameter will be mixed in the air to form aerosol. It will be infected after inhalation. Wearing a mask can effectively reduce the probability of aerosol transmission. Whether you use medical surgical masks or medical protective masks, you can be protected to some extent. Wearing a mask, while blocking the virus, can also prevent infected people from spreading pathogens to the outside world to a certain extent, so whether you are infected or not, you must wear a mask correctly and properly, for your own health and the health of others. However, even the best N95 mask can't guarantee 100%. Need to be reminded that the protective effect of any type of mask is time-limited, so it must be replaced regularly. It is recommended to change the mask every 2~4 hours. If the mask is contaminated, it should be replaced as soon as possible. When not in use, the medical mask is folded and stored in a self-sealing bag. It is not recommended to take off the mask and put it directly into the pocket or bag, which may easily cause secondary pollution of the medical mask. Be sure to fold it and put it in a clean self-sealing bag, and the side that touches the nose and mouth will be folded inward.

Third, contact spread. If a normal person's hand comes into contact with something contaminated by virus, it will be contaminated, and then it will come into contact with his oral cavity, nasal cavity, eyes and other mucous membranes, which will cause infection. This is called direct or indirect contact transmission, so wearing a mask is far from enough to protect yourself. Wash your hands frequently and get together less.

Finally, I have eighteen truths about personal protection, that is, "Don't go out less, don't have parties, wear masks, ventilate frequently, wash your hands more and stay up late less", don't believe rumors, don't spread rumors, keep a good attitude and actively cooperate with epidemic prevention personnel to take various epidemic prevention measures.