Yep. Mycoplasma affects mice too. I breed them and have had to consult my exotic vet on the issue of intermittent coughing and sneezing of one of the female breeders. She advised me to spread out the enclosures of which I am only housing two with 1.1 in each. Deep cleaning and disinfecting is paramount. Especially in tank enclosures which is what I have for my small setup. The substrate is important too. Vet recommended "Yesterday's News" which is a pelleted paper substrate that is dust free. The ammonia content in mice urine is one of the problematic chemicals.