15. Have taken oral or parenteral (including intra-articular) corticosteroids of any dose within 30 days prior to study vaccination. 16. Have taken high-dose inhaled corticosteroids within 30 days prior to study vaccination. High-dose defined as >840 mcg/day of beclomethasone dipropionate CFC or equivalent. 17. Received licensed live vaccine within 30 days prior to the first study vaccination, or plans to receive licensed live vaccine within 30 days before or after each study vaccination.