This isn't true. There's firm evidence that cloth face coverings prevent infected people from transmitting the disease as much as they would otherwise.There is absolutely no evidence that face masks make any difference to the spread of the virus, unless you are fully suited and booted in PPE.
It's not similar to PPE, which is there to protect its wearer.
The effect increases significantly the more people wear them:
Mathematical modelling suggests that a face covering that is 60% effective at blocking viral transmission and is worn by 60% of the population will reduce R0 to below 1.0.26 This leaves plenty of room for error as people make their own imperfect coverings from old clothing and as some people either cannot or will not wear a face covering. Not all respiratory viruses are filtered equally; masks appear to be more efficient at blocking Sars‐Cov‐2 than rhinoviruses or adenoviruses, for example.27 Materials scientists have shown that whilst different fabrics are more or less efficient at blocking particle transmission, cotton weaves with high thread count or a double layer of two different fabrics (eg, cotton‐flannel) typically provides high filtration efficiency
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