Date	Event	Description
31 March 2013	New search has been performed	Searches conducted. We identified 268 RCTs and 479 observational studies and no new studies were included in this 2013 review update.
31 March 2013	New citation required but conclusions have not changed	Based on our literature review, we now determine that two outcome measures, (influenza‐like illness (ILI) (Appendix 1) and all‐cause mortality (Appendix 6)), reported in the first and second publications of this review, are inappropriate measures of influenza vaccine effectiveness. They are not registered indications for the vaccine. Therefore, the outcome data from Hayward 2006 (main outcome measure all‐cause mortality and secondary outcome measure ILI) and Oshitani 2000 (outcome measure ILI) are no longer presented.
10 December 2009	Feedback has been incorporated	Feedback comment and reply added.
21 June 2008	Feedback has been incorporated	Feedback comment added.
13 May 2008	Amended	Converted to new review format.
23 May 2006	New search has been performed	Review first published, Issue 3, 2006.