Table 3.

Sero-conversion rates as reported by Langley et al. [59], defined as the proportion of vaccinees with a pre-vaccination titer <1:10 and a post-vaccination titer ≥1:40, or a pre-vaccination titer ≥1:10 and at least a 4-fold increase in post-vaccination titer

TIV vaccination group	Seroconversion rate
	With respect to B Yamagata	With respect to B Victoria
TIV-Vic (n = 870)	41.3% (n = 359)	71.5% (n = 622)
TIV-Yam (n = 877)	73.4% (n = 644)	29.9% (n = 262)

Abbreviations: TIV-Vic, trivalent influenza vaccine with Victoria lineage B strain; TIV-Yam, trivalent influenza vaccine with Yamagata lineage B strain. The numbers of sero-converters (n) were calculated from the percentages.