About the Authors

Nathan Ford

Contributed equally to this work with: Nathan Ford, Hannah Hamilton Hurwitz, Benedetta Allegranzi, April Baller

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

fordn@who.int

Affiliation World Health Organization, Geneva, Switzerland

Hannah Hamilton Hurwitz

Contributed equally to this work with: Nathan Ford, Hannah Hamilton Hurwitz, Benedetta Allegranzi, April Baller

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

Affiliation World Health Organization, Geneva, Switzerland

Roger Chou

Roles Investigation, Methodology, Writing – review & editing

Affiliation Pacific Northwest Evidence-based Practice Center and the Department of Medical Informatics and Clinical Epidemiology, Oregon Health & Science University, Portland, Oregon, United States of America

Vicky Willet

Roles Investigation, Writing – review & editing

Affiliation World Health Organization, Geneva, Switzerland

May Chu

Roles Investigation, Writing – review & editing

Affiliation Colorado School of Public Health, Anschutz Medical Campus, Aurora, Colorado, United States of America

Mitchell J. Schwaber

Roles Investigation, Writing – review & editing

Affiliations National Center for Infection Control, Israel Ministry of Health, Jerusalem, Israel, Faculty of Medical and Health Sciences, Tel Aviv University, Tel Aviv, Israel

Kathleen Dunn

Roles Investigation, Writing – review & editing

Affiliations World Health Organization, Geneva, Switzerland, Infectious Disease and Vaccination Programs Branch Agency: Public Health Agency Canada, Ottawa, Ontario, Canada

João Paulo Toledo

Roles Investigation, Writing – review & editing

Affiliation World Health Organization, Geneva, Switzerland

Alice Simniceanu

Roles Investigation, Writing – review & editing

Affiliation World Health Organization, Geneva, Switzerland

Madison Moon

Roles Investigation, Writing – review & editing

Affiliation World Health Organization, Geneva, Switzerland

Rebekah Thomas

Roles Investigation, Methodology, Writing – review & editing

Affiliation World Health Organization, Geneva, Switzerland

Benedetta Allegranzi

Contributed equally to this work with: Nathan Ford, Hannah Hamilton Hurwitz, Benedetta Allegranzi, April Baller

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

Affiliation World Health Organization, Geneva, Switzerland

April Baller

Contributed equally to this work with: Nathan Ford, Hannah Hamilton Hurwitz, Benedetta Allegranzi, April Baller

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

Affiliation World Health Organization, Geneva, Switzerland

Competing Interests

I have read the journal’s policy and the authors of this manuscript have the following competing interests: RC received funding from the Agency for Healthcare Research and Quality to conduct a review on masks. He also received funding from WHO to conduct a review on risk factors for transmission in HCWs, and consulting fees as the methodologist for the WHO Health Emergencies Programme COVID-19 Infection Prevention and Control Guideline Development Group. NF, HH, VW, KD, JPT, AS, MM, RT, BA and AB work for the World Health Organization. There are no other competing interests.