Ferrets are quite susceptible to Cryptococcus gattii, which is a genus of fungus. These fungi grow in culture as yeasts. Cryptococcosis, or cryptococcal disease, is a potentially fatal fungal disease.
Untreated cryptococcosis is always fatal.
If your ferrets is wheezing, you need to take him to the veterinarian immediately. It be indicative of an illnesses, which ferrets are prone to different ones
Cryptococcosis
There are numerous dangers to ferrets, You have to ferret proof their environment, ferrets need to be handle by a responsible person (no small kids), ferrets need a special diet, they are carnivores (meat eaters) and cannot digest fruits or vegetables. Ferrets can be prone to illness and disease if not taken care of properly. They could be perceived as prey by some dog breeds.
M. L. Littman has written: 'Cryptococcosis, torulosis or European blastomycosis' -- subject(s): Cryptococcosis
I don't believe there's any limit on how many can live together. They question would be how many ferrets can it's owner handle and take care of them properly. Some people are prone to "ferret math" , owning several ferrets
Ferrets do need vaccinations against rabies and canine distemper (which is airborne, possibly transmitted from your shoes or clothing, a ferret does not survive this disease) Most ferrets in the US are from Marshall Farms and are prone to disease and illnesses due to early neutering and genetics. It's important to know the signs of illness in disease in ferrets, which you may not detect, but a veterinarian can. Ferrets are know to hide their pain and illnesses.
Ferrets are only bred with other ferrets
The collective term for a group of ferrets is a "a business of ferrets" or "a cast of ferrets".
Cryptococcosis, sarcoidosis, and histoplasmosis are the main infections.
Panda ferrets the same as other ferrets, just the coloring is different.
Ferrets do have a ribcage