San Francisco virus recommendations mask San Francisco

Are you using the correct mask to prevent COVID-19? Read what health ministry recommends

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What experts are saying: A N95 mask with valve filter the air inhaled by the wearer for comfortable breathing.

The doctors and researchers across the world have warned against using the N95 masks with a respiratory valve. The valve in your N95 mask may be a 'one-way valve' which is only going to protect the person wearing it.

One-way valve does not filter aerosols coming out of your mouth. It will not protect anyone around that person from potential exposure to virus they exhale. “The ones with the valves or openings on the front are NOT safe, and may actually propel your germs further," San Francisco department of public health wrote on Twitter. “Any mask with a one-way valve is only going to protect the person wearing it.

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