(Pfizer Animal Health) Pinnacle I.N. is an intranasal vaccine to aid in the prevention of strangles caused by Streptococcus equi in healthy horses. Administer 1 dose into one nostril. Repeat in 2 to 3 weeks. Revaccinate annually with a single dose. Pinnacle I.N. contains live culture and requires mixing. Includes nasal applicator tips.