Table 2 HI Data for Pandemic Shift Cohort vaccinated in 2009–2011.

Antigen	V 1	V 2	Group	GMT (pre)	GMT (post)	Titer ≥ 40	Fold-change
A/Brisbane/59/2007 (H1N1)	−	−	Identical	45	86	57	1.9
A/Brisbane/59/2007 (H1N1)	+	−	Differing	42	155	71	3.7
A/California/07/2009 (pdmH1N1)	+	+	Identical	187	326	78	1.7
A/California/07/2009 (pdmH1N1)	−	+	Differing	16	149	63	9.6
A/Perth/16/2009 (H3N2)	+	+	Identical	18	90	63	5.1
A/Perth/16/2009 (H3N2)	−	+	Differing	16	51	48	3.1
B/Brisbane/60/2008 (Victoria)	+	+	Identical	63	304	79	4.8
B/Brisbane/60/2008 (Victoria)	+	+	Differing	27	326	79	12.2

The names of the antigens used in the HI assay are listed in the first column. In the second and third columns + and − are used to indicate if the antigen was used in the first (V1) or second (V2) vaccination. The geometric mean titers prior to vaccination (pre) and after both vaccinations (post) are shown for each antigen for each group (Identical or Differing). The number of titers ≥40 is shown as a percentage. The fold-change is the average increase between the pre- and post-vaccination titers.

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