Feline infectious peritonitis is a viral disease of cats caused by certain strains of feline coronavirus. Listlessness, lethargy, decreased or absent appetite, weight loss, and a fluctuating fever are commonly reported clinical signs. Some infected cats may have accumulation of fluid in body cavities.
Feline panleukopenia is a parvoviral infectious disease of kittens typically characterized by depression, anorexia, high fever, vomiting, diarrhea, and consequent severe dehydration.