FHV refers to Feline Herpes Virus, a common viral disease affecting cats. Feline herpes virus is mainly spread through direct contact or through sneezing, and the infected objects are usually cats.

The main symptoms of feline herpes virus infection include increased eye and nose secretions, eye inflammation, depression, etc. For kittens, the incidence of this disease is quite high. Once a kitten carries the herpes virus, the incidence rate is 100% and the fatality rate is 50%.