Table 3.

Geometric mean titers (GMTs) of anti-NA Abs against different influenza A(H1N1) strains after seasonal flu vaccination.

A(H1N1) and A(H1N1) pdm09 Strains	Anti-NA GMTs (CI 95%) Post-vaccination		p-Value
	(15–64 Years)	(≥65 Years)
A/PR/8/1934	139.3 (109.3–176.8)	253.2 (202.6–315.1)	<0.001
A/Weiss/1943	858.9 (639.7–1115.6)	1,012.5 (772.2–1349.4)	0.402
A/FM/1/1947	331.2 (251.8–426.1)	542.6 (450.7–656.2)	0.002
A/Brazil/11/1978	685.6 (533.6–861.9)	464.3 (378.8–583.3)	0.012
A/Brisbane/59/2007	411.3 (326.5–515.2)	566.7 (471.4–677.2)	0.028
A/California/07/2009	342.8 (270.2–435.3)	460.3 (370.3–563.6)	0.077