H1N1 / H3N2 + B: H stands for hemagglutinin and n for neuraminidase. For 2013, the who recommended the following viral composition a/california/7/2009 (h1n1)pdm09; a/texas/50/2012a (h3n2); b/massachusetts/2/2012-like virus.
Answered 5/19/2013
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