EuroFlu: 98% of antigenically characterized viruses from European Region are similar to 2010/2011 vaccines strains.

[Giuseppe]

Source: EuroFlu, Weekly Influenza Electronic Bulletin, full page: http://www.euroflu.org/cgi-files/bulletin_v2.cgi

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Based on the genetic characterization of 194 influenza viruses:

• 103 belonged to the pandemic A/California/7/2009 A(H1N1) clade;
• 5 belonged to the pandemic A/Christchurch/16/2010 A(H1) clade;
• 23 belonged to the pandemic A/Hong Kong/2213/2010 A(H1) clade;
• 25 were reported as A(H1) pandemic not attributed to group category but belonging to the recently emerged A/England/142/2010 subgroup characterized by S185T substitution in the HA;
• 9 belonged to the A(H3) clade represented by A/Perth/16/2009;
• 1 belonged to the A(H3) clade represented by A/Brisbane/10/2007;
• 5 belonged to the A(H3) clade represented by A/Victoria/208/2009;
• 16 belonged to the subgroup represented by A/Hong Kong/2121/2010 in the A/Victoria/208/2009 A(H3) clade;
• 6 belonged to the B/Bangladesh/3333/2007 clade (Yamagata lineage), and
• 1 to the B/Brisbane/60/2008 clade (Victoria lineage).

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