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Table 1 Culture confirmed influenza episodes identified by immunoperoxidase staining or by hemagglutination inhibition titration

From: Challenge of conducting a placebo-controlled randomized efficacy study for influenza vaccine in a season with low attack rate and a mismatched vaccine B strain: a concrete example

Total Number of Influenza A or B isolates

Number identified by immunoperoxidase typing only

Number identified by hemagglutination inhibition for A/H1, A/H3 and B lineage

10 Influenza A isolates

3

5 H3

A/California/7/2004-like*

  

2 H1

A/New Caledonia/20/1999*

and

A/Czech Republic/109/2005*

36 Influenza B isolates

1

35

B/Hong Kong 330/01-like**

  1. * Antigenically related to the H1N1 or H3N2 vaccine strains
  2. ** Not antigenically related to the B strain from the Yamagata lineage contained in the vaccine