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1). that neutralized cocirculating H3N2 influenza viruses isolated over a 20-yr period. This is the first study to show the effectiveness of H3N3 COBRA HA vaccines in a host with preexisting immunity to influenza. KEYWORDS:COBRA, H3N2, broadly protective vaccine, ferrets, hemagglutination inhibition, influenza, neutralization == ABSTRACT == The vast majority of people already have preexisting…