Medical face masks are less useful then N95 respirators, but not very much less so and better than nothing.
Even just cloth is better than nothing, if used properly.
Priority should be given to healthcare workers.
Info, references & disclaimer below.
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I only considered those on the field (ie no mechanical analysis or use of machines; only PPEs worn by doctors in hospitals) and those with pathogens of size comparable to COVID-19.
- Two reported no significant difference in effectiveness
- One says N95 way more effective
The last study is the only one reporting that participants were involved in high-risk procedures, whereas the others only reported use in proximity
- jamanetwork.com/journals/jama/… via @StephenPiment
- jamanetwork.com/journals/jama/…
- atsjournals.org/doi/full/10.11… via @krystoferivanov
- Healthcare workers need them
- If personal supply is limited, you should use them only when the risk is higher.
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- touching your nose, lips or eyes because you sweat
- touching the exterior or their strings and then touching your nose, lips or eyes
- giving a false sense of security & making you go out
- Is definitely not even close to being 100% effective
- Is better than nothing
- It's useful not only because it protects you, but especially because it protect others
- Shouldn't give a false sense of security
- Wearing any kind of PPE seems to be better than nothing if worn properly, but
- might have contraindications if unsafe behavior is adopted, so
- it's important you weight properly benefits and risks.
That said, I'm not a doctor and this is not medical advice.
If you use scarves make sure to wash them at high temperature before reusing!
(30 Celsius is definitely not enough; I've read 60 Celsius for at least 30 mins)
In general (continues below)