Veterinary teams can use this article to discuss their knowledge and practice recommendations about feline leukemia. Without prevention, the life expectancy of any cat that contracts FeLV is short.
Source: Tufts Catnip, April 2016. (partial link)
The incidence of feline leukemia has declined significantly since the introduction several decades ago of a vaccine designed to protect against FeLV infection. “The disease used to be far more common,” says Kristine Burgess, DVM, an assistant professor in the department of clinical sciences at Tufts. “Before the vaccine was developed, FeLV was typically affecting perhaps 15 percent of the feline population. Nowadays, that number is down to about five percent or less in the U.S.”