Anti-virus can use two kinds of masks, one is disposable medical surgical masks, and the other is N95 masks. Disposable medical surgical masks, currently the most widely sold and inexpensive masks on the market, are mainly composed of three layers of material, the core layer is composed of meltblown cloth, which has a good function of filtering fine particles and viruses. Disposable medical can not be reused, need 4-5 hours to replace once, and N95 mask can be reused 2-3 days, with better filtration function, but the price is expensive, you can choose a different mask according to their own economic situation, as well as for the degree of danger in and out of the occasion.