The Weekly Epidemiological Record (WER) for 5 March 2010, vol. 85, 10 (pp 81–92) includes: Recommended viruses for influenza vaccines for use in the 2010–2011 northern hemisphere influenza season. The discussion notes “…it is expected that A(H1N1) pandemic 2009, A(H3N2) and B viruses will co-circulate in the northern hemisphere 2010-2011 with the likelihood that the pandemic A(H1N1) 2009 viruses will predominate. Based on recent epidemiological evidence it is anticipated that seasonal A(H1N1) viruses are unlikely to circulate at significant levels during the 2010–2011
northern hemisphere season; hence it has not been recommended for inclusion in the 2010–2011 vaccine. A virus of B/Victoria/2/87 lineage, the predominant lineage of type B viruses circulating since September 2009, has been recommended…
It is recommended that the following viruses be used for influenza vaccines in the 2010-2011 influenza season (northern hemisphere):
– an A/California/7/2009 (H1N1)-like virus;
– an A/Perth/16/2009 (H3N2)-like virus;
– a B/Brisbane/60/2008-like virus.