disposable surgeon doctor medical surgical face mask

Which Face masks can prevent the virus? what is the reason?
Yes and only Medical masks and Hospital surgeon mask
General Disposable Face masks, that is, the standard number is GB2626-2006 respiratory protection articles (N9 × / KN9X)
Hospital surgeon mask GB2626: Self-priming filter type anti-particulate respirator, test standard: 85L / min, NaCl aerosol 0. 075um. Additional requirements for wearing can not leak, air tightness test.
Medical masks GB19083: This standard is applicable to filtering particulates in the air and blocking droplets and liquids in the medical work environment. Self-priming filter Medical masks for body fluids and secretions. Test standard: 85L / min, NaCl aerosol 0. 075um. The initial requirement is to filter 95%. In addition, the blood splatter cannot be penetrated, and there is no additional air tightness requirement.
Therefore, medical protection is better than respiratory protection, and in the current state: if non-medical personnel are not in the same room with the virus carrier at a close distance, and you will not exchange fluids with suspected cases at a close distance Choose Disposable Face masks GB2626 as long as it is used correctly, there is no problem. Because the virus is small in diameter, it cannot survive alone in the air. Other dust droplets and the like are their carriers. With a particle size of 0. 3 micron, anti-fog Face masks that can achieve a filtration efficiency of more than 95% can prevent influenza viruses.