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. 2010 Jul 14;17(9):1481–1483. doi: 10.1128/CVI.00223-10

TABLE 2.

HI titers against seasonal influenza viruses for 397 samples that were HI negative for p-H1N1-09 antibodiesa

No. of samples HI negative
Titer H1 H3 B/Yamagata/1688 B/Victoria/287
10 0 1 2 0
20 44 26 56 43
40 27 46 60 30
80 7 31 47 23
160 1 26 34 5
320 1 20 13 1
640 1 22 9 2
≥1,280 1 9 4 0
Total 82 181 225 104
a

Eight of 397 samples were positive in ELISA. Several samples were reactive for multiple seasonal influenza viruses.