Influenza A virus subtype H1N1, also known as A(H1N1), is a subtype of influenzavirus A and the most common cause of influenz
Bottles of adjuvants for use with the Pandemrix H1N1 flu vaccine are seen lined up during a vaccination programme in Schiedam in this November 23, 2009 file picture. To match Special Report VACCINES-NARCOLEPSY.
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