mouth ulcers

Feline Calicivirus (FCV) is an important and common cause of Upper Respiratory Infection (URD) and oral disease in cats. This virus occurs worldwide with various strains that vary greatly in virulence (the ability to produce disease). Clinical disease may vary from subclinical (not clinically apparent) to combinations of oral, respiratory disease, and lameness. There are more than 40 strains of FCV, one of which may have high mortality rates and is referred to as the virulent systemic (VS), or the hemorrhagic form of FCV.