Covid face masks RETURN in new advice from World Health Organisation

Association of State-Issued Mask Mandates and Allowing On-Premises Restaurant Dining with County-Level COVID-19 Case and Death Growth Rates — United States, March 1–December 31, 2020

Still Confused About Masks? Here's the Science Behind How Face Masks Prevent Coronavirus

Carbon dioxide rises beyond acceptable safety levels in children under nose and mouth covering: Results of an experimental measurement study in healthy children - ScienceDirect

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It may be time to break out the masks against Covid, some experts say

Philly COVID cases rising again, City urges mask-wearing - WHYY

Updated WHO COVID prevention guidance may endanger rather than protect, some experts say

WHO warns of global shortage of face masks and protective suits, Coronavirus

Coronavirus Updates: Covid-19: C.D.C. Guidance Prompts Caution in Some States - The New York Times

Coronavirus: Why attitudes to masks have changed around the world

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When and how to use masks

CDC encourages people to wear masks to prevent spread of Covid, flu, RSV

WHO urges travellers to wear masks as new COVID variant spreads