Intended for healthcare professionals

Letters Why numbers matter

Covid-19: Surveillance systems for the new normal

BMJ 2022; 376 doi: (Published 21 March 2022) Cite this as: BMJ 2022;376:o710
  1. Arnaud Chiolero, epidemiologist and professor of public health,
  2. Stefano Tancredi, fellow in public health,
  3. Stéphane Cullati, senior lecturer in epidemiology
  1. Population Health Laboratory (#PopHealthLab), University of Fribourg, 1700 Fribourg, Switzerland
  1. achiolero{at}

What have we learnt about surveillance after two years of a pandemic? Will we have the numbers and information to identify, early enough, new surges of the pandemic? Nothing is less sure,1 but let’s hope that strong surveillance systems will be part of our “new normal.”

In many European countries, measures to limit the spread of SARS-CoV-2 infections are being progressively lifted. If we are lucky enough, and thanks to vaccination and a partial herd …

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