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“-theres a difference when something is inside the body and once its expelled out it changes”
No, it doesn’t. What possible mechanism would change it?
Waste product is expelled because it doesn’t belong in the body, at least not long term. It has to go, if only to make room for the new waste that is being created. The same could be said for mucus. But the bacteria you exhale are not waste product and they are not being expelled, they just happen to be in your breath when it goes out. There’s no possible harm they could do by coming back in. Millions of their identical siblings are still in your body, doing whatever they do, and a few thousand more or less makes no difference.
By the way, the home-made masks we’re wearing now are not medical masks anyway, so it doesn’t affect medical workers. The advice changed because of the emerging evidence from other countries that they are effective, not in protecting the wearer, but in protecting everyone else.