Feline herpesvirus (viral
rhinotracheitis): This virus causes upper respiratory infection with fever, sneezing, eye and nasal discharge,
conjunctivitis (inflammation of the inner eyelids and mucous membranes around the eyes), inflammation of the cornea (keratitis), and lethargy.
This virus shares symptoms with other feline viruses such as
rhinotracheitis (differentiated from calicivirus by more sneezing, eye inflammation and discharge) and chlamydiosis where in addition to some of the aforementioned symptoms your cat would also be suffering from
conjunctivitis (red eyes).