Deltagerne fik med 21 dages mellemrum to injektioner af Focetria med enten 7, 5 eller 15 mikrogram hæmagglutinin (et protein, der findes i influenzavirus).
The participants received two injections of Focetria, containing either 7.5 or 15 micrograms of haemagglutinin (a protein found in flu viruses), 21 days apart.