Evidence Shows Masks Really Do Reduce the Spread of COVID-19 and Lower Infection Risk

Frontiers Rationale for Mass Masking in Controlling the COVID-19 Pandemic

How masks protect against COVID-19: Understanding the science - Boston Children's Answers

How switching to an N95 mask gives a 75x boost in COVID protection

Masks Cochrane review: There's still not strong evidence for masks' effectiveness.

Why we should all be wearing face masks

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

What is the evidence to support the 2-metre social distancing rule to reduce COVID-19 transmission? - The Centre for Evidence-Based Medicine

Physical distancing, masks can dramatically reduce COVID-19 transmission: Study - ABC News

Effectiveness of public health measures in reducing the incidence of covid- 19, SARS-CoV-2 transmission, and covid-19 mortality: systematic review and meta-analysis

Coronavirus: Why attitudes to masks have changed around the world

Effectiveness of public health measures in reducing the incidence of covid- 19, SARS-CoV-2 transmission, and covid-19 mortality: systematic review and meta-analysis