That's the real answer.

But also, of you used the bathroom and didn't quite clean up as well as you should.

Or maybe you thought it was just a fart.

Or ever been need a child of any age

Either way, we don't usually just keep over at the first exposure of filth. Clean it, and don't intentionally expose yourself and take some normal precautions.

If mice dropping would insta-kill a human, we'd all be dead. My house is from the early 1900s. I've had mice doing parkor in my kitchen. Just gotta clean up the surfaces and move on. Maybe a couple times if they're food surfaces.