Thanks for the link!

I don't believe so on the mouse thing since it's built pretty air tight.

We do get in new live rats from time to time at work. I know we got some adult lab rats in about two weeks ago that we gassed and put in the freezer later that day. I guess that is a possibility that I picked something up from work since I do make a few trips back there daily to the dumpsters or to ask someone something.