The introduction of a mandatory mask policy was associated with significantly reduced COVID-19 cases in a major metropolitan city

• Nick Scott ,

  Roles Conceptualization, Formal analysis, Methodology, Writing – original draft, Writing – review & editing

  ¶‡ These authors share first authorship on this work.

  Affiliations The Burnet Institute, Melbourne, Australia, Department of Epidemiology and Preventive Medicine, Monash University, Melbourne, Australia

  ⨯
• Allan Saul ,

  Roles Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Writing – original draft, Writing – review & editing

  * E-mail: allan.saul@honorary.burnet.edu.au

  ¶‡ These authors share first authorship on this work.

  Affiliation The Burnet Institute, Melbourne, Australia

  https://orcid.org/0000-0003-0665-4091

  ⨯
• Tim Spelman,

  Roles Formal analysis, Methodology, Writing – review & editing

  Affiliation The Burnet Institute, Melbourne, Australia

  ⨯
• Mark Stoove,

  Roles Conceptualization, Formal analysis, Investigation, Writing – original draft, Writing – review & editing

  Affiliations The Burnet Institute, Melbourne, Australia, Department of Epidemiology and Preventive Medicine, Monash University, Melbourne, Australia

  ⨯
• Alisa Pedrana,

  Roles Investigation, Methodology, Writing – review & editing

  Affiliations The Burnet Institute, Melbourne, Australia, Department of Epidemiology and Preventive Medicine, Monash University, Melbourne, Australia

  ⨯
• Alexander Saeri,

  Roles Formal analysis, Investigation, Methodology, Writing – review & editing

  Affiliation BehaviourWorks Australia, Monash Sustainable Development Institute, Monash University, Melbourne, Australia

  ⨯
• Emily Grundy,

  Roles Formal analysis, Investigation, Methodology, Writing – review & editing

  Affiliation BehaviourWorks Australia, Monash Sustainable Development Institute, Monash University, Melbourne, Australia

  ⨯
• Liam Smith,

  Roles Formal analysis, Investigation, Methodology, Supervision, Writing – review & editing

  Affiliation BehaviourWorks Australia, Monash Sustainable Development Institute, Monash University, Melbourne, Australia

  ⨯
• Michael Toole,

  Roles Investigation, Methodology, Writing – review & editing

  Affiliation The Burnet Institute, Melbourne, Australia

  ⨯
• Chandini Raina McIntyre,

  Roles Methodology, Writing – review & editing

  Affiliation Biosecurity Program, The Kirby Institute, University of New South Wales, Sydney, Australia

  ⨯
• Brendan S. Crabb,

  Roles Conceptualization, Writing – review & editing

  Affiliations The Burnet Institute, Melbourne, Australia, Department of Immunology and Pathology, Monash University, Melbourne, Australia, Doherty Institute and School of Population and Global Health, University of Melbourne, Parkville, Australia

  ⨯
• Margaret Hellard

  Roles Conceptualization, Methodology, Writing – original draft

  Affiliations The Burnet Institute, Melbourne, Australia, Department of Epidemiology and Preventive Medicine, Monash University, Melbourne, Australia, Doherty Institute and School of Population and Global Health, University of Melbourne, Parkville, Australia, Department of Infectious Diseases, The Alfred Hospital, Melbourne, Australia

  https://orcid.org/0000-0002-5055-3266

  ⨯