WHO supports medical-grade masks for people over the age of 60 and in poor health, and said they need to be of high quality. transmission of the virus.
WHO recommends more sophisticated masks made of three layers of fabric in public transport or in places where they cannot keep their distance, such as shops. People who are over 60 years old or in poor health also say. medical masks should be worn "in areas where physical distance cannot be achieved" due to conditions "increased risk of infection and or adverse consequences". mask, say officia.
The recommended layers are the cotton that is absorbed closest to the surface, followed by the polypropylene layer and then the liquid-resistant synthetic layer.
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