Quarantine is good for diseases transmitted via direct contact, such as a skin fungus, or the fecal-oral route, such as a parasite. For an airborne virus or fungus, it doesn't do much unless each animal stays in its own room and each room has either a HEPA air filter or its own ventilation system.
Adenovirus has been transmitted to animals in another room even when caretakers are strictly assigned to one room only and no supplies are shared. No amount of washing can scrub the virus out of the air.
The Zombie Mama is here!