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Schematic of study design. Previously primed (A) or unprimed (B) subjects were subdivided into groups that received either 15 µg or 90 µg of vaccine. All of the previously primed subjects received the inactivated subvirion influenza A/Vietnam/1203/04 vaccine in 2005–2006. Of these subjects, 16 had received baculovirus-expressed recombinant influenza A/Hong Kong/156/97 vaccine in 1997–1998.
