What is the difference between a FHV and FCV ?

What is the difference between a FHV and FCV?

FHV-1 is a DNA virus that, while it does not mutate, remains in a dormant state following acute infection, and can become reactivated later in life in response to stress. FCV is a small single-stranded RNA virus that readily mutates during replication resulting in many different strains of the virus.