Unlike our other cats, Solomon is FIV+. Feline Immunodeficiency Virus (FIV) is a disease that causes suppression of the immune system that may limit a cat’s ability to protect itself against secondary infections caused by common bacteria, viruses, protozoa and fungi. It can be contagious to other cats, but primarily through deep bites between unfriendly cats. FIV cats can live alongside other nonaggressive cats, and should remain indoors only for their own and other cats’ safety.