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Rhinotracheitis is an infectious respiratory disease of cats characterized by fever,conjunctivitis, nasal and ocular discharges and sneezing. It is due to a herpes virus.

Calicivirus is an infectious oral and upper respiratory tract disease of domestic cats. It  typically causes an acute disease characterized by pyrexia, oral ulceration and mild ocular and nasal discharges. Some cats may become lethargic. The virus has also has been associated with chronic stomatitis or gingivitis, pneumonia, diarrhea, jaundice and skin ulcerations. Cali viral infections can result in ulcers foriming in the mouth of affected cats.

Chlamydia is mainly an upper respiratory infection. Chlamydia infections tend to favor the eyes and can cause infections here.

Feline Leukemia is a retrovirus the primarily affects cats, is transmitted through saliva, and causes suppression of the immune system and anemia, leading to infections and diseases known as leukemia and lymphoma.

Rabies is an acute, infectious, often fatal viral disease of most warm-blooded animals especially wolves, cats and dogs, that attacks the central nervous system and is transmitted by the bite of an infected animal. Rabies can be transmitted to humans and there is no known cure.