Just throw a towel over the coffeemaker and you're okay.
Seriously, I don't know if I'd be concerned about a "plume." Where'd you hear that? That sounds like an OCD hypochondriac thing.
What about the faucet handles?
What about the pillowcases?
What about your lips?
Germs... they're flying around everywhere... they're probably coming under the door from outside when somebody walks past with doggy poo on the bottom of their shoes.
We're all gonna die!
Seriously, I wouldn't worry about it, but if you're inclined to, why not rinse off the coffee pot and throw a towel over the whole thing?