Seroprotektionstitre, bestemt ved SRH- analyse mod den homologe vaccinestamme (A/ Vietnam/ 1203/ 2004) blev konstateret hos 65, 5% af personerne fra 18 til 59 år og hos 59, 4% af personerne på 60 år eller derover 21 dage efter boostervaccinationen med 7, 5 µg- dosis af A/ Vietnam - stammevaccine.
Seroprotective titres as determined by SRH assay against the homologous vaccine strain (A/ Vietnam/ 1203/ 2004) were observed in 65.5% of subjects aged 18 – 59 years and in 59.4% of subjects aged 60 years and older at 21 days after a booster vaccination with the 7.5 μ g dose of the A/ Vietnam strain vaccine.