The main symptoms of feline herpesvirus infections are fever, frequent sneezing, conjunctivitis, rhinitis, and often salivation.
The main symptoms of Chlamydia felis infection include serous to mucopurulent conjunctivitis, nasal discharge, and sneezing.
Feline calicivirus most often affects the lining of the mouth and the lungs. Some strains cause sores in the mouth, while others produce fluid buildup in the lungs (pulmonary edema) and pneumonia.