The mask is not a panacea, but a serious barrier in the way of coronavirus. To such conclusion scientists of Hong Kong in the experiment with hamsters. To do this, the sick and the healthy animals were placed in cells opposite each other. And two weeks later it turned out that where the mask was set partitions, hamsters were predominantly healthy. Sick animals in a barrier-free environment. The researchers concluded, – transmission can be reduced by 50 percent when wearing medical masks.