>>My ladydeez have been busily sewing masks this afternoon
Here masks are compulsory. However, there is no standard for masks and the law says that they must be worn, not worn properly.
Also, of course, the mask will not stop the wearer getting the virus. Their use is that the wearer will not pass the virus on. Therefore the standards for each are quite different.
If you want to wear a mask to stop yourself catching the virus, then it needs to be a full N95 respirator mask tightly fitted to the face - they are both uncomfortable and restrictive. Though you should also bear in mind that you can contract the virus through your eyes.
If you want to wear a mask which will reduce the risk of you passing on the virus, then pretty much any old crap which stops the water droplets from your sneeze or cough will do the job.
The standard tie around the face, surgical type mask is to prevent you passing it on. Which is the point behind the WHO advice that only those at risk is symptomatic need wear one.
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