EXACTLY. People are forgetting that even with the BEST precautions (ahem, the nurse in Seattle that was in FULL PROTECTIVE GEAR at the nursing home - and STILL got infected), they are far from fool-proof, and without proper training . . . forget it.
No.
It's not about being "foolproof". It's about
reducing the probability of infection.
And masks do just that.
Can a face mask stop coronavirus? Covid-19 facts checked
Studies show as much as a fivefold reduction in transmission when in close contact with a person with COVID-19. No, they do not protect you as in "
give you 100% protection on their own". But they do protect you as in "
significantly reduce your risk of contracting the disease when in close contact with an infected person". They block aerosols (to varying degrees, depending on the type of the mask, how properly it's used, etc). They stop you from touching your mouth and nose. They do good, even though they do not offer complete protection.
That said, just wearing one when you're walking down the street or whatnot does nothing. Because that's not how the disease is transmitted. It's transmitted by close (<2m) contact (yes, there are exceptions, but they're not
normal), and contaminated surfaces. The biggest argument against stocking up on masks is that many places that
actually need masks (such as hospitals) are having trouble getting them in sufficient quantity.
In short: when it comes to masks, follow the instructions of your local health authorities. If they want you using them, use them. If they don't want you using them, don't. It will vary from place to place.
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Also while we're at it: anyone who tells you "
hand sanitizer does no good, only soap; hand sanitizer is for bacteria" is also wrong. WHO recommends either hand sanitizer or soap for general hand disinfection against COVID-19. However, if the hands are visibly dirty, only soap is appropriate.
Hand sanitizer works by denaturing proteins. Proteins fold differently in alcohol vs. in water. Disrupting the shape of a protein disrupts its functionality. Encapsulated viruses, such as COVID-19, are particularly vulnerable to this (non-encapsulated viruses, such as novovirus, are relatively resistant to hand sanitizers).