What do the FIV and FeLV viruses do?
FIV and FeLV affect cats in similar ways, primarily by interfering with the immune system’s ability to ward off infections. Bacteria, viruses, protozoa and fungi found in the everyday environment – where they usually don’t affect healthy cats – can cause severe illness in FIV and FeLV infected cats. Various kinds of cancer and blood diseases are much more common in cats infected with either virus too. Early signs of infection are often subtle and commonly seen in cats that are simply not feeling well.
