A streetcar official and passengers in Seattle who wore masks during the 1918 epidemics.
By the time the Spanish flu hit in 1918, Wu's mask was well known among scientists and even more of the public. Clusters around the world ramped up production of similar masks to help reduce the spread of the flu.

Everything came to you from God
Respect it so that it stays in your life

One of the ways to reduce the spread of infectious diseases is to use a mask🎭

It was interesting and useful information
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