Table 2.
Summary of molecular characterization of influenza A and B viruses based on haemagglutinin sequences by season (the numbers of samples studied are shown in brackets), including the recommended vaccine strains to use
| 2006/07 | 2007/08 | 2008/09 | 2009/10 | 2010/11 | 2011/12 | |
|---|---|---|---|---|---|---|
| Influenza A virus—seasonal A(H1N1) | ||||||
| Recommended vaccine strain | A/New Caledonia/20/99 | A/Solomon Islands/3/2006 | A/Brisbane/59/2007 | A/Brisbane/59/2007 | – | – |
| Characterized strains | Tessaloniki/24-like (1) | Tessaloniki/24-like (1) | – | – | – | – |
| 29 1 | Solomon Islands/3-like (3) | |||||
| Brisbane/59-like (24) | ||||||
| Influenza A virus—A(H1N1)pdm09 | ||||||
| Recommended vaccine strain | – | – | – | A/California/7/2009 | A/California/7/2009 | A/California/7/2009 |
| Characterized strains | – | – | – | No-Nelson's Clade 7 (9) | No-Nelson's Clade 7 (2) | – |
| 123 1 | California/7-like (67) | California/7-like (1) | ||||
| Hong Kong/3934-like (1) | Christchurch/16-like (2) | |||||
| St. Petersburg/27-like (8) | ||||||
| St. Petersburg/100-like (1) | ||||||
| Astrakan/1-like (32) | ||||||
| Influenza A virus—A(H3N2) | ||||||
| Recommended vaccine strain | A/Wisconsin/67/2005 | A/Wisconsin/67/2005 | A/Brisbane/10/2007 | A/Brisbane/10/2007 | A/Perth/16/2009 | A/Perth/16/2009 |
| Characterized strains | California/7-like (1) | – | California/7-like (1) | – | Perth/10-like (2) | Perth/10-like (1) |
| 117 1 | Wisconsin/7-like (2) | Brisbane/10-like (19) | Iowa/19-like (1) | Iowa/19-like (18) 2 | ||
| Brisbane/10-like (12) | Iraq/7-like (1) | Stockholm/18-like (5) | ||||
| Stockholm/18-like (3) | England/259-like (26)3 | |||||
| Victoria/361-like (25) | ||||||
| Influenza B virus | ||||||
| Recommended vaccine strain | B/Malaysia/2506/2004 | B/Malaysia/2506/2004 | B/Florida/4/2006 | B/Brisbane/60/2008 | B/Brisbane/60/2008 | B/Brisbane/60/2008 |
| (Lineage) | (B/Victoria) | (B/Victoria) | (B/Yamagata) | (B/Victoria) | (B/Victoria) | (B/Victoria) |
| B/Victoria-lineage characterized strains | Malaysia/2506-like (5) | Brisbane/60-like (17) | – | Malaysia/2506-like (2) 4 | ||
| 54 1 | Brisbane/60-like (27) | Brisbane/60-like (3) | ||||
| B/Yamagata-lineage characterized strains | Florida/4-like (2) | Shangai/361-like (4) | – | – | Bangladesh/3333-like (1) | Brisbane/3-like (1) |
| 72 1 | Egypt/144-like (2) | Florida/4-like (13) | Florida/01-like (8) | Stockholm/12-like (39) | ||
| Bangladesh/3333-like (2) | ||||||
In case of different phylogenetic variants, the most frequent is marked in bold letters.
1
The partial NA sequences for phylogenetic and molecular characterization could not be obtained from some of these strains.
2
One intra-clade reassortant strain (Iowa/19 HA; England/259 NA).
3
One intra-clade reassortant strain (England/259 HA; Stockholm/18 NA).
4
Intra-clade reassortant (Brisbane/60 HA; Malaysia/2506 NA).