Are masks effective against coronavirus?

Most Validated
Apr 10, 20

Even N95 respirators lead to some amount of leakage and don't provide full protection

3M one of the world's largest manufacturers of masks and respirators says, “No matter how well a respirator seals to the face and how efficient the filter media is, wearers should expect a small amount of leakage inside any respirators.”

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Less Validated
Apr 10, 20

N95 filtering facepiece respirators (FFR) remove viruses from inhaled air

N95 masks remove particles from the air breathed through it. These respirators filter out at least 95% of very small (0.3 micron) particles. N95 FFRs are capable of filtering out all types of particles, including bacteria and viruses.

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Unchallenged
Apr 10, 20

Used surgical masks that are disposed of improperly can increase the risk of coronavirus spreading

Because surgical masks are designed to keep infections from spreading (by trapping droplets from the wearer), used masks can become laden with coronavirus. If these virus-carrying masks are disposed of improperly (e.g. outside of a hospital setting), they can infect others.

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Most Validated
Apr 10, 20

A trial of hospitals in Ontario, Canada found no significant difference in levels of protection provided by surgical vs N95 masks

A randomised trial of 446 nurses in the emergency departments, and medical and paediatric units of 8 tertiary care Ontario hospitals found that the incidence of laboratory-confirmed influenza was similar in nurses wearing the surgical mask and those wearing the N95 respirator.

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Less Validated
Apr 10, 20

Different types of masks show different levels of effectiveness against coronavirus

There are homemade cloth face masks, surgical masks and N95 respirators. A 2008 study showed that homemade masks may be half as effective as surgical masks, and up to 50 times less effective than N95 respirators.

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Unchallenged
Apr 10, 20

Masks may be effective at protecting people from COVID-19, as long as they're not reused

A 2006 report by the US National Academy of Sciences discourages the reuse of masks because the hazardous buildup of harmful particles within the mesh, cannot be cleaned out without damaging the fibres or other components of the device (such as the straps or nose clip).

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Apr 10, 20
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Apr 10, 20
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Apr 10, 20

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Apr 10, 20
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Apr 10, 20
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Apr 10, 20
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Apr 10, 20
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Apr 10, 20
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Apr 10, 20

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Apr 10, 20