A recent blog comment claimed masks, especially cloth masks, were only “theatre.” That’s simply not true, and you can prove it yourself… but first a few basics.
A cough can travel as fast as 50 mph and expel almost 3,000 droplets in just one go. Sneezes can travel up to 100 mph and create upwards of 100,000 droplets. Several studies found that larger droplets [from someone not wearing a mask] easily carried for more than two meters and as far as six meters. Those droplets and aerosols can hang around for hours, and longer in poorly ventilated areas.
The British medical journal The Lancet recently released a meta-analysis on studies dealing with “person-to-person virus transmission.” Among the many findings was one that masks were an effective way to reduce transmission, since they function as an effective “source control” restricting the flow of droplets and aerosols.
This past July 16th, the CDC released a statement specifically addressing cloth face coverings, stating that they should be used, and that studies showed that they were effective in reducing the spread of Covid-19. Masks block direct airflow, which reduces the amount of virus expelled and the distance it can travel… and that reduces contagion.
And if you’re still skeptical… look at the world map. Places with high masking rates and social distancing are doing MUCH better than we are.
By themselves, masks aren’t a cure-all. They are rated at reducing the risk of virus transmission by roughly 70%, but many flu vaccines don’t do much better. Masks also have one other problem. My mask protects you twice as well as it protects me. In effect, my fate lies more in your hands than mine. Now, that’s always been true in every functioning society, but most people don’t see it or like to admit it. We are indeed our brother, or sister’s keeper.
And that’s a problem in a country where some 40% of the population believes a President whose operating maxim is effectively, “Me first, screw you.”
Now…for that personal proof. Hold your hand fully extended in front of your mouth. Cough, hard. If you’re reasonably healthy, you should be able to feel the airflow from your cough on your fingers. For most people that’s a distance of a little less than three feet. Put on a mask, and do it again. When I do it, and I have fairly strong lungs, I can’t feel any airflow through the mask [mine is cloth, with HEPA filter inserts]. Some airflow will escape through the edges of the mask, but any aerosols or droplets emitted will stay close to the body, and combined with social distancing and adequate ventilation, will effectively protect others.
As for masks being theatre… that’s not quite true. Wearing a mask isn’t theatre, but not wearing one is… and it’s called tragedy.