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Three Cochrane reviews focussing on the prevention of influenza in healthy adults, healthy children and in the elderly are long-running reviews under the same senior author team*. *The protocol for the oldest review was first published 20 years ago. Over the years the reviews have progressively accumulated evidence leading to ever greater stability in their conclusions set defined criteria to guide any further updates. The reviews in their final updated and stabilised form have now been published together with a covering blog telling the story. For an overview of the three reviews, see the covering editorial <https://community.cochrane.org/news/why-have-three-long-running-cochrane-reviews-influenza-vaccines-been-stabilised> The reviews are available in full on the Cochrane Library: <http://onlinelibrary.wiley.com/doi/10.1002/14651858.CD001269.pub6/abstract> Vaccines for preventing influenza in healthy adults <http://onlinelibrary.wiley.com/doi/10.1002/14651858.CD001269.pub6/abstract> <http://onlinelibrary.wiley.com/wol1/doi/10.1002/14651858.CD004879.pub5/abstract> Vaccines for preventing influenza in healthy children <http://onlinelibrary.wiley.com/wol1/doi/10.1002/14651858.CD004879.pub5/abstract> <http://onlinelibrary.wiley.com/wol1/doi/10.1002/14651858.CD004876.pub4/abstract> Vaccines for preventing influenza in the elderly <http://onlinelibrary.wiley.com/wol1/doi/10.1002/14651858.CD004876.pub4/abstract> Professor Tom Jefferson Senior Associate Tutor University of Oxford Oxford OX2 6GG