1)- COVID-19 infection prevention and control living guideline: mask use in community settings, 22 December 2021 -
https://www.who.int/publications/i/item/WHO-2019-nCoV-IPC_masks-2021.1

This first edition of the Infection Prevention and Control COVID-19 Living Guideline – Mask use in community settings provides the most up to date technical guidance on mask use in community settings in the context of COVID-19.

2)- WHO recommendations on mask use by health workers, in light of the Omicron variant of concern: WHO interim guidelines, 22 December 2021 -
https://www.who.int/publications/i/item/WHO-2019-nCoV-IPC_Masks-Health_Workers-Omicron_variant-2021.1

This document provides updated interim recommendations on the use of masks by health workers providing care to patients with suspected or confirmed COVID-19, in light of the rapid spread of the Omicron variant of concern of SARS-CoV-2.

About WHO

The World Health Organization provides global leadership in public health within the United Nations system. Founded in 1948, WHO works with 194 Member States, across six regions and from more than 150 offices, to promote health, keep the world safe and serve the vulnerable. Our goal for 2019-2023 is to ensure that a billion more people have universal health coverage, to protect a billion more people from health emergencies, and provide a further billion people with better health and wellbeing.