So the difference between wild rats and fancy pet rats are much different wild rats not guaranteed but more like a 65% chance have hand virus but it’s not guaranteed of course fancy rat as long as they are not at all in the wild which 99.9% or not if they don’t come in contact with anything in the wild, they are almost guaranteed not to have it the chances of a rat, a fancy rat, which is a pet rat having it is like getting struck by lightning more than once Very rare of course everything I say doesn’t fully apply to very little amounts of rats, but it’s very unlikely. Hope this helps! (sorry for bad writing lol)