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

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: The findings of this systematic review and meta-analysis support physical distancing
of 1 m or more and provide quantitative estimates for models and contact tracing to
inform policy. Optimum use of face masks, respirators, and eye protection in public
and health-care settings should be informed by these findings and contextual factors.
Robust randomised trials are needed to better inform the evidence for these interventions,
but this systematic appraisal of currently best available evidence might inform interim
guidance.