Observe these data from table 3 in the Eurosurveillance report, "Effectiveness of seasonal 2010/11 and pandemic influenza A(H1N1)2009 vaccines in preventing influenza infection in the United Kingdom: mid-season analysis 2010/11", for samples positive for H1N1 between September 2010 to January 2011, demonstrate a vaccine failure rate of approximately 50%, regardless of vaccination schedule.
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