This virus is another major cause of upper respiratory tract infection in cats. Widespread and highly contagious, its symptoms of fever, ulcers and blisters
on the tongue and pneumonia (inflammation of the lungs) can range from mild
to severe, depending on the strain of virus present.

Once again, treatment of this disease can be difficult. Even if recovery
does take place, a recovered cat can continue to infect other animals, as well as experience chronic sneezing, runny eyes and severe gum disease. Vaccination is therefore tremendously important.