Feline Viral Rhinotracheitis (Feline Herpesvirus) is transmitted through casual contact and the air. It causes eye infections, and upper respiratory signs like sneezing, coughing and sore throat. Adult cats usually recover but often require veterinary attention; however young kittens can become very sick and even die from this infection.
Feline Calicivirus is transmitted through casual contact as well, and causes more severe respiratory signs including pneumonia, as well as sometimes affecting joints. Adult cats often recover but usually require veterinary attention, however kittens and seniors can become very sick and die from this infection.
Feline Panleukopenia is transmitted through stool, vomit and secretions. It causes respiratory and severe gastrointestinal signs and is often fatal.
Rabies is transmitted through bodily fluids, usually from a bite wound, and can infect many different warm-blooded animals. Rabies infects the nervous system and causes behavior changes, paralysis and eventual death.
Feline Leukemia is often transmitted through bites but also sexual activity and saliva (mutual grooming, sharing food dishes). It infects white blood cells, causing poor immune function.