I just called my 2 rat specialists vets (they aren't too specialized but a lot more so than any other vet) but one did not even know about blue cheese toxins & the other did but they did not know what they could do to test for it, they say it must show up as some sort of toxin in thier blood but they say that the blood is probably too corrugated (sp?) probably by now. They also said they werent' sure what to do with my remaining rats, they are looking into it now & will call me back w/ any info. They say for now to just make sure they are drinking lots to flush out their system so I added pedialyte to their water to make it more nutritious & to to taste better so they drink more.