Geometric Mean of HAI Titers on Days 1 and 43 Day 1 Day 43 n GMT (95% CI) n GMT (95% CI) Phase 2 Placebo 98 5, 48 (5, 23 - 5, 74) 97 5, 63 (5, 31 - 5, 96) Vaccine 95 5, 62 (5, 34 - 5, 91) 95 62, 65 (52, 10 - 75, 34) Phase 3 Placebo 45 5, 04 (4, 96 - 5, 11) 45 5, 08 (4, 97 - 5, 18) Vaccine 222 5, 20 (5, 06 - 5, 34) 222 27, 61 (24, 38 - 31, 27) Phase 2/3 Vaccine 317 5, 32 (5, 19 - 5, 45) 317 35, 30 (31, 60 - 39, 43) Phase 2: On Day 43, the HAI GMT for the 15 mcg vaccine group was 62.65 compared with 5.63 for the placebo group.