Wearing the mask backwards still provides some isolation from the virus, but it decreases. Wearing the mask backwards will reduce the isolation effect, but still have isolation effect. The quality of the mask and the way of wearing the mask directly affect the isolation effect. The outer layer of the mask has a water-blocking effect, the middle layer is a meltblown cloth, which is essentially a fiber filter that adsorbs virus particles onto it, and the inner layer of the mask has a moisture-absorbing effect, which may affect comfort if the mask is worn backwards. If you do not enter the infected area is generally safer, there is no need to worry too much, pay attention to it in the future, if you wear a mask in the infected area wear the reverse there is the possibility of being infected, to a safe place in time to replace the new mask. Some people wear masks for sun protection, if only for sun protection, masks worn backwards will not affect the effect of sun protection, do not need to be too concerned. If you wear the mask backwards, you need to go to a safe place to change the new mask in time, to prevent the occurrence of infectious diseases.