Really? What were they talking about? The only thing I can suspect is Encephalitozoon Cuniculi spores and even then it seems pretty extreme. I don't take any precautions cleaning my three out, I actually said to someone yesterday if my kid ate a rabbit dropping it wouldn't worry me (not that I'd encourage it of course though).
im a vet nurse and all my risk assessments were wasrning of cat urine so i cant touch the trays but theres no mention of rabbits, ive never heard of that.