Caliciviruses see also:
There are numerous strains of the feline calicivirus (FCV) with only slight serological differences but large genetic divergence, resulting in wide variations in virulence. Symptoms of FCV may vary from inappetence and fever to joint pains and muscular pain. In rare cases, interstitial pneumonia occurs. The typical proliferate and exudative ulcers in the oral cavity are often aggravated by secondary bacterial infections, i. a. with pasteurella.