Mask use in the context of COVID-19 - Interim guidance, 1 December 2020

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This document, which is an update of the guidance published on 5 June 2020, includes new scientific evidence relevant to the use of masks for reducing the spread of SARS-CoV-2, the virus that causes COVID-19, and practical considerations. It contains updated evidence and guidance on the following:

  • mask management;
  • SARS-CoV-2 transmission;
  • masking in health facilities in areas with community, cluster and sporadic transmission;
  • mask use by the public in areas with community and cluster transmission;
  • alternatives to non-medical masks for the public;
  • exhalation valves on respirators and non-medical masks;
  • mask use during vigorous intensity physical activity;
  • essential parameters to be considered when manufacturing non-medical masks (Annex).