You might enjoy a night out listening to the latest in â??retroâ? music, but your cats should avoid â??going retroâ? at all costs! Retroviral diseases, such as Feline Leukemia and Feline Immunodeficiency Virus, are more common than most pet owners realize and are truly threats to your catâ??s well-being.   Fortunately, through testing protocols and lifestyle choices, owners can help keep their feline friends safe from these deadly diseases.