Feline herpesvirus, also known as feline viral rhinotracheitis (FVR), is a type of herpes virus that causes upper respiratory infections. Almost half of all upper respiratory infections in cats are related to a feline herpesvirus infection. It is spread through contact with secretions from infected cats, or through inhalation of the virus that has been released into the air from an infected cat’s sneeze. It is a highly contagious virus, but there is a vaccine that will protect cats and kittens from the disease.