This is something I’ve heard a lot, and assuming it’s true, what’s the science behind it? Surely holes in masks are the same size no matter whether the germs are heading in or out, but I’m guessing it’s not about the holes and I’m missing something.
Obligatory disclaimer: I’m not an anti-masker, I’m still wearing it in shops for example. This is just me wanting to understand.
In: Biology
Covid is a fluid-borne disease. It leaves a person’s body in water droplets they breath out. The water droplets are what masks actually block, making mask effective at stopping you from spreading covid to other people. However, there are lots of places in your body that covid could enter through: mouth, nose, eyes, ears, genitalia, anus, open cuts, etc. Not all of these places are covered by masks, making them less effective at protecting you once you have been exposed.
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