This vaccine creates localized immunity that supposedly reduces the incidence of clinical signs and illness but many pets develop mild to more
serious upper respiratory signs when given the live intranasal vaccination.
Young kittens in multicat households (eg, breeding households) are most likely to be affected and there may also be
mild upper respiratory signs.
Feline viral rhinotracheitis (Feline Herpes Virus)- This virus also causes
upper respiratory signs but it can also cause corneal (eye) ulcers.