"Any mask with a one-way valve is only going to protect the person wearing it. It won’t protect anyone around that person from potential exposure to virus particles they exhale,” he told Healthline. “It may give the people surrounding them a false sense of security."
http://www.healthline.com/health-news/certain-type-n95-mask-harm-covid19-spread
"We put together this video because our firefighters, EMTs, and paramedics were coming on scene with COVID-positive patients who were wearing these masks,” said Adrienne Sims, the director of San Francisco Firefighters Local #798.
We wanted to show our first responders how to approach a patient who is wearing such a mask and how to protect themselves without touching the mask and contaminating their own personal protective equipment (PPE),” Sims told Healthline."
http://twitter.com/sffflocal798/status/1257385993725935617
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