I had a very old rat named Ben. He lived in a two story cage and while a bit skinny during his last few weeks, appeared healthy. When we found he had passed away, he was covered in mites. My friend needed his cage so I washed it thoroughly and sanitized it very well. She housed her old male, Lenny, in it. Everyone in her colony appeared healthy but Lenny's age was unknown but you could just tell he was old. My friend found him dead this morning. Lenny's son, Bryan was cuddled up with his dead body. She went to remove Bryan from the cage and found mites all over Bryan and Lenny's body. My new male, Bryan's brother, Bradley is fine. I checked him over well and as far as I can tell, he has no mites.

So basically, Ben dies, he's covered in mites. Lenny dies, he's covered in mites, but everyone that is healthy is fine. Bryan died this morning as well. Anyone know what we can do about this?