Fleas Kill!
Fleas are not just a summer problem. If you get them into your carpet or furniture, the problem can continue for quite a while into the winter.
Frontline (or Frontline Plus) is the best treatment (kitten dose) and is available at Pet Supplies Plus, at the vet's office or over the Internet. Fleas by themselves can kill a ferret, and ticks are even worse. When they bite, they snack on the ferret's blood. Since ferrets are so small, it doesn't take long for the fleas and/or ticks to cause anemia and possible infection.
If you see fleas or ticks on your ferret, take care of them immediately. Do not use flea baths or chemicals (sprays, wipes or spot-ons) made by Hartz or other "discount" companies. (i.e. don't use BioSpot, for one) Flea collars don't work well, and can make the ferrets sick.
The only flea killers we consider safe for ferrets are Frontline, Revolution, or Advantage.