Viral disease is affecting kittens and unvaccinated cats.

A Richmond animal society is warning cat owners of a viral disease affecting cats in Metro Vancouver.

Feline panleukopenia, also called feline distemper, is a “highly contagious and often fatal” disease that is especially dangerous to young and unvaccinated cats, according to Regional Animal Protection Society (RAPS).

The society said there have been cases detected across B.C. and is warning cat owners to be aware of arising symptoms.

This virus can cause lethargy, loss of appetite, fever, vomiting, dehydration, and in some cases, diarrhea or sudden death.

Acute illness generally lasts no more than five to seven days, but RAPS highlights young kittens are especially at high risk of this disease.