A top US health official say the US needs 300 million face masks for healthcare workers. But masks are not necessarily effective against coronavirus.
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China Daily/Reuters

Health and Human Services Sec. Alex Azar said the US needs at least 300 million face masks for health officials as the country braces the rapid spread of the coronavirus.

The HHS secretary said the US already has 30 million, but would need 270 million more.

The N95 respirators have proven to be not very effective in preventing infection, as they can't fully filter out the airborne coronavirus particles.

The Trump administration sent a request to Congress for $2.5 billion be...

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