Intended for healthcare professionals

Letters 2012 meta-analysis of vaccines against influenza

Incorrect news on a good old trial

BMJ 2022; 377 doi: (Published 20 June 2022) Cite this as: BMJ 2022;377:o1487
  1. J André Knottnerus, epidemiologist and emeritus professor of general practice
  1. Maastricht University Medical Centre, PO Box 616, 6200 MD Maastricht, The Netherlands
  1. andre.knottnerus{at}

As a former member of The BMJ’s editorial board, I am a big fan of its focus on sharing knowledge and expertise to improve healthcare outcomes and have contributed to this on several occasions. But I have to share a different kind of experience.

I was made aware that my group’s independently funded, primary care based, placebo controlled randomised controlled trial showing effectiveness of influenza vaccination in reducing serological influenza and influenza-like illness in older people, with a Cochrane …

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