Healthy adults ( n = @ ) received @ vaccine doses ( days @ and @ ) of either investigational CC-H@N@ vaccine ( @ g or @ g of hemagglutinin antigen -LSB- HA -RSB- with the AS@ adjuvant system or @ g of plain HA ) , embryonated-egg-derived vaccines ( @ g of HA with AS@ or @ g of plain HA ) , or placebo .