Raven I'm actually surprised your rats are "prone" to RI's. I can't say I've seen very much of that at all with my colony. Could it be a need for a bit more ventilation, a different bedding choice or less rats per enclosure. Not saying you are doing anything wrong hon but sometimes just a little tweak here or there can make all the difference.

I did get a bit of rats with the sneezing and sniffling going on but they were recent pet store purchases when I ran short one time on small feeder rats. My permanent group though never seems to have any of these issues.