Neither FIV or FeLV are immediate death sentences, but they will severely affect your cat's quality of life.
Much like in cases of Feline Infectious Peritonitis (FIV), fluid accumulation occurs in the advanced stages.
It is also important to make sure both cats have been tested for FIV, FELV, FIP.
Feline Immunodeficiency Virus (FIV) is a retrovirus that is often referred to as the kitty version of HIV.
Female cats infected with FIV usually don't spread the condition to their offspring through birth or even through their milk.