Date	Event	Description
6 March 2017	Feedback has been incorporated	See Feedback section for comments regarding different interpretations in other reviews of the effects of chlorhexidine on mortality in critically ill patients.
6 March 2017	Amended	Edits to Analysis 1.2 and 4.2. In response to the feedback, review authors decided that mortality data derived from trial flow diagrams in Berry 2011 and Berry 2013 should not be used. This does not change the mortality results: chlorhexidine versus placebo, RR 1.09 (95% CI 0.96 to 1.23). Removal of Berry 2011 and 2013 mortality data also means no conclusions can be drawn about the effect on mortality of bicarbonate rinse versus water, Listerine versus water or Listerine versus bicarbonate (previous analyses 4.2.6, 4.2.7, 4.2.8).
20 July 2016	New citation required but conclusions have not changed	6 new studies included. 3 previously included studies now excluded. Some changes to Methods (see 'Differences between protocol and review' section).
17 December 2015	New search has been performed	Search updated.
27 November 2013	Amended	Minor typographical error.