This popped up, as far as I can tell, in the past 7 or 8 hours. I checked on the rats (I have two in a small wire cage right now) when I checked on the snakes at about 10 AM, I didn't notice anything, then I checked on them again and noticed her left eye was swollen up. One of my friends, who keeps rats as pets and has had sick ones, says she wouldn't feed it off to her snakes. I have no problem euthanizing if that is the case, but I won't have the ability to set up a kill chamber with CO2 until Thursday or Friday at the soonest, and am rather worried about the other rat in the cage with her, which is a pet that is growing out to go in with our other, larger females. The sick one doesn't seem to even notice the infection. She's grooming and eating and moving around like a normal rat. I haven't noticed them fighting, and there's nothing sharp in the cage - they're on paper bedding, and haven't found anything sharp in the cage since I noticed her.