Face masks and eye protection decrease the risk of infection, too.

The systematic review and meta-analysis was commissioned by the World Health Organization. The findings were published today in The Lancet.

"Physical distancing likely results in a large reduction of COVID-19," said lead author Holger Schünemann, professor of the departments of health research methods, evidence, and impact, and medicine at McMaster.

Schünemann is co-director of the World Health Organization (WHO) Collaborating Centre for Infectious Diseases, Research Methods and Recommendations. He also is director of Cochrane Canada and McMaster GRADE Centre.

"Although the direct evidence is limited, the use of masks in the community provides protection, and possibly N95 or similar respirators worn by health-care workers suggest greater protection than other face masks," Schünemann said. "Availability and feasibility and other contextual factors will probably influence recommendations that organizations develop about their use. Eye protection may provide additional benefits."

The systematic review was conducted by a large, international collaborative of researchers, front-line and specialist clinicians, epidemiologists, patients, public health and health policy experts of published and unpublished literature in any language.

They sought direct evidence on COVID-19 and indirect evidence on related coronaviruses causative of Severe Acute Respiratory Syndrome (SARS) and Middle East Respiratory Syndrome (MERS). The team used Cochrane methods and the Grading of Recommendations, Assessment, and Evaluation (GRADE) approach which is used world-wide to assess the certainty of evidence.

They identified no randomized control trials addressing the three coronaviruses but 44 relevant comparative studies in health-care and non-health-care (community) settings across 16 countries and six continents from inception to early May 2020.

The authors noted more global, collaborative, well-conducted studies of different personal protective strategies are needed. For masks, large randomized trials are underway and are urgently needed.

The scientific lead is Derek Chu, a clinician scientist in the departments of health research methods, evidence, and impact, and medicine at McMaster and an affiliate of the Research Institute of St. Joe's Hamilton.

"There is an urgent need for all caregivers in health-care settings and non-health-care settings to have equitable access to these simple personal protective measures, which means scaling up production and consideration about repurposing manufacturing," said Chu.

"However, although distancing, face masks, and eye protection were each highly protective, none made individuals totally impervious from infection and so, basic measures such as hand hygiene are also essential to curtail the current COVID-19 pandemic and future waves."

The work was funded by the World Health Organization and involved close collaboration with the American University of Beirut, Lebanon and many international partners.

Story Source:

Materials provided by McMaster University. Original written by Tina Depko. This article was first published on Brighter World. Read the original article. Note: Content may be edited for style and length.

Journal Reference:

1. Derek K Chu, Elie A Akl, Stephanie Duda, Karla Solo, Sally Yaacoub, Holger J Schünemann, Derek K Chu, Elie A Akl, Amena El-harakeh, Antonio Bognanni, Tamara Lotfi, Mark Loeb, Anisa Hajizadeh, Anna Bak, Ariel Izcovich, Carlos A Cuello-Garcia, Chen Chen, David J Harris, Ewa Borowiack, Fatimah Chamseddine, Finn Schünemann, Gian Paolo Morgano, Giovanna E U Muti Schünemann, Guang Chen, Hong Zhao, Ignacio Neumann, Jeffrey Chan, Joanne Khabsa, Layal Hneiny, Leila Harrison, Maureen Smith, Nesrine Rizk, Paolo Giorgi Rossi, Pierre AbiHanna, Rayane El-khoury, Rosa Stalteri, Tejan Baldeh, Thomas Piggott, Yuan Zhang, Zahra Saad, Assem Khamis, Marge Reinap, Stephanie Duda, Karla Solo, Sally Yaacoub, Holger J Schünemann. Physical distancing, face masks, and eye protection to prevent person-to-person transmission of SARS-CoV-2 and COVID-19: a systematic review and meta-analysis. The Lancet, 2020; DOI: 10.1016/S0140-6736(20)31142-9