Evaluation of the Effectiveness of Pandemic Influenza A(H1N1) 2009 Vaccine Based on an Outbreak Investigation During the 2010-2011 Season in Korean Military Camps

We evaluated the effectiveness of H1N1pdm09 vaccine in the 2010-2011 season in an outbreak setting. Although the result was not sensitive to any analytical method used and ILI case definition, the magnitude of effectiveness was lower than estimated in the 2009-2010 season.