Surgical masks as well as N95 masks can prevent infection by the new coronavirus.
The wearing of masks can not only play the role of filtration, but also play a role in blocking respiratory droplets. Medical surgical masks can block 90% of the particles above 5um, and can block most of the droplet viruses, applicable to medical personnel and the general population.
N95 masks have a stronger protective effect, able to block 95% of the particles above 0.3um, but N95 wear breathability and comfort is poor, only for medical personnel.
Whether surgical masks or N95 masks, in the completion of the wear need to check the airtightness, only wear the right to play a protective effect. After a long period of time, the protective effect of the mask will gradually decline, so it needs to be replaced every 4 hours or so.
Masks do not provide 100% protection against viruses, so it is important to practice good hand hygiene and gather less people.