Feline leukemia (FeLV) and feline immunodeficiency virus (FIV) are serious viruses that can be transferred from mother to kitten via bite wounds. We recommend that all kittens be tested for these diseases. Both of these diseases can be in the body and not cause any sickness for months to years and then suddenly make your cat very sick. If you cat is infected but not sick it could potentially infect other cats especially if it goes outside and gets into a fight.
FeLV and FIV both cause problems with the immune system that lead to immune suppression. When the immune system is not working properly it makes your cat susceptible to all types of infectious diseases and even cancer.