There's plenty of disagreement inside the medical community on the issue, particularly when it comes to homemade cloth masks that are recommended by the CDC for public use. Not everyone has access to surgical masks. In this case, which science do you believe as a layman?
Are you referring to the difference between airborne and droplet protections?
Or are you suggesting the medical community is split on the usefulness of masks? Because the usefulness part is not really a serious debate, as every hospital has some kind of mask policy and has always offered masks for folks even long before this virus. The one I work at had stations throughout the hospital with disposable masks... Well, until COVID wiped out the mask supply. Point is, cloth masks have
always been a recommended tool.
Homemade masks are an imperfect solution. They are only adequate for droplet protections. Large particulate. They do not filter out COVID-19, for example. For that you would need a true respirator with a fitted seal. Doctors and staff that worked with infectious diseases would frequently have these available already.
But... cloth masks do reduce viral load distributed both outgoing and incoming. If you cough with a cloth mask on, the amount of virus that spreads off into the air is reduced significantly. Not entirely, but it helps a lot. Likewise, you are less likely to directly breathe in a large viral load with a mask over your face.
Viral load refers to how much you actually breath in. It's quite possible to inhale a little virus and not get sick. Or if you do, it will not be as severe.
Also take into consideration that spread is often done through touching a surface then your face and vice versa. Masks help cut this down as well.
Among experts in epidemiology, over 85% plan on wearing them until at least the winter. And over 50% for at least a year. Only 4% said they would stop wearing them now.
So it's not really a big split in the community about the usefulness of masks. I hope all this helps shed a little light on the we use them and how professionals overwhelming recommend they are used now.
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