This version of the guidelines (version 4.0), includes the following recommendations: 1) a strong recommendation for mask use in community settings in higher risk situations; 2) a conditional recommendation to encourage a risk-based approach for mask use in community settings in situations that do not fall within the scope of the strong recommendation; 3) a good practice statement advising individuals with signs and symptoms suggestive of COVID-19 or those who test positive for COVID-19 to wear a medical mask when interacting with others in or outside of one’s household or sharing space with others; and 4) amendment of an existing good practice statement on the implementation of policies to reduce SARS-CoV-2 transmission to promote the revisiting and strengthening of PHSM as new evidence arises. The strong and conditional recommendations for mask use in the community complement each other, outlining possible scenarios in which masks may benefit the wearer. As some situations (see strong recommendation) necessitate mask wearing for maximum protection, others (see conditional recommendation) may be better suited for a risk-based approach.

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