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Disease Organism
Signs/Comments
Feline viral rhinotracheitis (FVR), also called feline herpesvirus type 1 (FHV-1)
Accounts for the majority of acute upper respiratory infections in cats; tends to affect eyes and nose; see text for signs
Feline calicivirus (FCV)
Often hard to distinguish from feline viral rhinotracheitis; tends to affect mouth and lungs; see text for signs
Chlamydia infections (Chlamydia felis and Chlamydia psittaci)
Conjunctivitis, sneezing, eye discharge, fever may develop; rarely causes pneumonia (feline pneumonitis); of lesser importance than FHV-1 and FCV
Mycoplasma infections
Conjunctivitis and inflammation of the nasal lining (rhinitis); of lesser importance than FHV-1 and FCV
Feline infectious peritonitis virus
May cause signs of mild upper respiratory tract infection; usually causes body-wide illness
Reoviruses
Virus replicates in respiratory tract; may not always cause respiratory signs
