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Influenza virus characterisation, summary Europe, May-June 2011

Surveillance report
Publication series: Influenza Virus Characterisation
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Influenza A(H1N1)pdm, influenza A(H3N2), and influenza B/Victoria/2/87 lineage viruses have been characterised genetically and antigenically.
Recently isolated A(H1N1)pdm viruses continue to fall into several genetic groups but all groups show antigenic similarity to the currently recommended vaccine virus A/California/7/2009.
A(H3N2) viruses also continue to fall into distinct genetic groups with some viruses showing antigenic difference from the currently used vaccine virus A/Perth/16/2009, but there is no consistent correlation of altered antigenicity with any genetic group.
Influenza B viruses of the B/Victoria/2/87 lineage have predominated over those of the B/Yamagata/2/87 lineage. Most of the B/Victoria/2/87 lineage viruses are genetically and antigenically similar to the currently recommended vaccine virus B/Brisbane/60/2008.

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