Dr John Campbell
@campbellteaching·3.3M subscribers·3.1K videos
Distance, masks and eye protection
Posted
June 2, 2020
Views
84,276
Likes
2,932
Comments
613
Engagement
4.21%
June 2, 2020
84,276
2,932
613
4.21%
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10:00Now PlayingLancet, 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
1st June, COVID-19 Systematic Urgent Review Group Effort (SURGE)
)311429/fulltext
)311831/fulltext
Methods
Meta-analysis
Physical distance, face masks, eye protection
172 observational studies, 16 countries, 6 continents
N = 25, 697, patients with Covid-19, SARS, MERS
No randomised controlled trials
Physical distance
Less than 1 metre = 13% risk
More than 1 metre, 3% risk
2 metres = 1.5% risk
3 metres = 0.75% risk
Face masks
N = 2,647
Wearing a mask risk = 3% risk of infection
Not wearing a mask 17% risk of infection
stronger associations with N95 or similar respirators
Eye protection
Associated with less infection (n=3713) aOR = 0·22
Interpretation
Quantitative estimates for models and contact tracing policy
Robust randomised trials needed
Systematic appraisal of currently best available evidence
WHO, 1 metre
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