Skip to main content

Preventing COVID - Masks, Meters and Eyewear

Jun 04, 2020 5:08 pm

A Lancet systematic review and meta-analysis provides the basis for physical distancing and the value of making as measures to prevent infection with coronavirus 2 (SARS-CoV-2) or COVID-19.

The analysis included 172 observational studies, no randomised controlled trials and 44 relevant comparative studies involving 25 697 patients.  Main points being:

  • Transmission of viruses was lower with physical distancing of 1 m or more  (n=10 736, pooled aOR 0·18, 95% CI 0·09 to 0·38)
    • protection was increased as distance was lengthened (change in relative risk [RR] 2·02 per m; pinteraction=0·041; moderate certainty).
  • Face mask use reduced the risk of infection (n=2647; aOR 0·15, 95% CI 0·07 to 0·34)
    • stronger associations with N95 or similar respirators compared with disposable surgical masks or similar reusable cotton masks
    • The risk of infection without a mask was 17.4%; but with a face mask was only 3.1%
  • Eye protection also resulted in less infection (n=3713; aOR 0·22, 95% CI 0·12 to 0·39) 

The authors conclude that randomised trials are needed to better clarify the benefit of these interventions.

Disclosures
The author has no conflicts of interest to disclose related to this subject

Add new comment

If you are a health practitioner, you may to comment.

Due to the nature of these comment forums, only health practitioners are allowed to comment at this time.

×