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Exploring the effect of previous inactivated influenza vaccination on seasonal influenza vaccine effectiveness against medically attended influenza: Results of the European I‐<scp>MOVE</scp> multicentre test‐negative case‐control study, 2011/2012‐2016/2017
Background Results of previous influenza vaccination effects on current season influenza vaccine effectiveness (VE) are inconsistent. Objectives To explore previous influenza vaccination effects on current season VE among population targeted for vaccination. Methods We used 2011/2012 to 2016/2017 I‐MOVE primary care multicentre test‐negative data. For each season, we compared current …