From Robert Roos at CIDRAP :
" A run of stability in the makeup of seasonal influenza vaccines continued as the World Health Organization (WHO) recently recommended using the same three flu strains in next year's Southern Hemisphere vaccine as are in the current Northern Hemisphere vaccine and were used last year in southern countries.
The recommendation means the WHO has seen little evidence of changes in circulating flu strains that would make the vaccines now in use a poor match for them.
The WHO experts recommended keeping the pandemic 2009 strain for the influenza A/H1N1 component of the vaccine, along with a Perth 2009 strain of A/H3N2 and a Brisbane 2008 strain of influenza B."
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