- 60 years of age and older receiving chronic/maintenance systemic corticosteroid therapy at a daily dose of 5 to 20 mg of prednisone or equivalent for at least the 2 weeks immediately prior to enrollment and expected to continue to receive a daily dose of 5 to 20 mg of prednisone or equivalent for the 6-week primary safety follow-up period (dose may vary within this range during the 6-week postvaccination period)