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 This is the layer that determines the quality of the mask. A "right" filter layer must allow air to pass easily, creating a sense of ventilation for users, but must have a structure sufficient to filter out particles of microscopic dust and bacteria. The World Health Organization (WHO) warns there are two basic routes of infection of the new strain of coronavirus (SARS-CoV-2), one that is spread directly through unprotected contact with nasopharyngeal drops. From people coughing, sneezing, runny nose into the respiratory tract; The second is indirect infection through infected intermediate surfaces. Therefore, for those who are not yet sick, wearing a mask is a measure to prevent droplets containing viruses from entering their own airways. As for people who are in the incubation period, wearing a mask has the effect of preventing the spread of the virus. In this case, if not wearing a mask, the nose and throat droplets contain viruses that can be fired from 2m away, which is very dangerous for those around them. “Wearing a mask incorrectly not only increases the risk of infection, but also wastes money. Because if an average person uses 3 masks a day and with a population of 10 million people today, one day consumes up to 30 million masks but it is not sure that it is effective, obviously too wasteful, "said doctor Dinh Hai. Yen - Centers for Disease Control (Department of Health HCMC) noted. Here are some things, people should note when using masks to effectively prevent translation

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