Found this for you...
What it is:
Panleukopenia is a severe, highly contagious viral disease of cats, kittens, raccoons, and mink. The panleukopenia virus tends to invade cells which are rapidly growing such as those of the digestive system, bone marrow (which makes blood cells), lymph tissue, and developing nervous system. This explains the common symptoms of diarrhea, vomiting, low white blood cell count, and seizures. A vaccine is available to protect against the disease.
How it spreads:
FPV is most commonly transmitted when a susceptible cat has contact with the feces or urine of infected cats. Infected cats shed the virus in their feces and urine up to 6 weeks after they recover. FPV can also be spread by contact with urine- or feces-contaminated items such as food bowls, water dishes, clothing, shoes, hands, bedding, and litter boxes.
The panleukopenia virus is also transmitted from the mother to the developing kittens within her uterus.
Symptons:
The symptoms of panleukopenia can be similar to those seen in dogs with parvo or canine distemper (vomiting, diarrhea, and seizures), which is why the disease is sometimes called 'feline distemper.' Panleukopenia in young unvaccinated kittens is usually fatal.
Young Cats: Many older cats who are exposed to feline panleukopenia virus do not show symptoms. However, young (3-5 months old) unvaccinated cats can become seriously ill. The onset of symptoms is sudden and cats will start out with fevers of 104-107°F, depression, and will not eat. These symptoms appear so suddenly, some owners think their pet has been poisoned. Three to four days later they will start vomiting and can become severely dehydrated. Severely dehydrated cats may hang their heads over the water bowl, but not drink. Diarrhea can also occur and may be bloody.
A cat who becomes severely dehydrated may develop a lower than normal body temperature hypothermia, become weak and even comatose. Such a cat is very susceptible to developing a bacterial infection in addition to the viral infection.
Cats who survive the symptoms for longer than five days will usually survive, but complete recovery (regaining of weight) may take several weeks.
Pregnant Cats and Their Litters: Pregnant cats who become infected with panleukopenia may abort or have stillborn kittens. In some cases, some of the kittens in the litter will be born incoordinated and have tremors, especially of the head. These nervous system changes are caused by the panleukopenia virus affecting the cerebellum, the part of the brain responsible for coordinating muscle movement. Mentally, these cats appear normal. As the kittens grow, they may be able to compensate and lead relatively normal lives.
Kittens may also have abnormalities of the retina of the eye (the back of the eye which receives the light and sends signals to the brain).
Sorry for the long post..