They are all highly contagious and are widespread. Upper respiratory infections are easily spread from cat to cat by sneezing, etc. Even a stray cat that seems to be outwardly healthy, may be a carrier of the disease and can infect your pet. It is a cancer-causing virus that often suppresses the ability to fight other infections. Kittens can be born with the virus.
Cats can have the leukemia virus for years before showing signs of the disease.
ALL CATS be tested and, if negative, vaccinated. Cats and kittens over 9 weeks of age receive an initial series of 2 vaccines 3-4 weeks apart. After this, a booster is given yearly. Is a contagious and fatal virus shed in the saliva, urine and feces of infected cats. Signs may include loss of weight, labored breathing, enlarged abdomen, and generalized illness.