There’s bacteria everywhere, on every surface, and even floating in the air. It’s not notable when there is bacteria somewhere, it’s notable when there isn’t!
This sounds like a question that was sparked by some particular headline or source. If this is the case, would you be willing to share it with us? We may be able to give more specific answers. [This youtube video explaining a study from about 5 years ago](https://www.youtube.com/watch?v=3UKWOPWrIi8) is the last thing about hand dryers and bacteria that I specifically remember hearing about, so there may be a new finding I’m not aware of.
A mix of what mentioned and the fact that your assuming you’re hands are perfectly free of bacteria and clean when you wash them.
First, any surface is going to have some kind of bacteria on it unless it is regularly sterilized, so unless that’s happening the hand dryer isn’t perfectly clean itself.
Next is yea that some room conditions (like humidity) can be good for bacteria growth.
But really the big one is that unless you do a super deep long clean, you hands arent perfectly bacteria free. And the bacteria that’s left on your hands can be blown off you hands and circulated around the room, possibly to another person.
Studies done for hospitals found that air dryers spread bacteria way more than paper hand towels, which is why hospitals typically use paper towels and not air dryers.
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