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(Original Caption) 1918-Chicago, Illinois- Inspecting Chicago street cleaners for Spanish influenza. Officials are wearing gauze masks.

(Original Caption) 1918-Chicago, Illinois- Inspecting Chicago street cleaners for Spanish influenza. Officials are wearing gauze masks.

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(Original Caption) New York Street cleaner wearing mask to check the spread of the influenza epidemic. "Better be ridiculous then dead" is the view of one official. BPA2# 3019

(Original Caption) New York Street cleaner wearing mask to check the spread of the influenza epidemic. "Better be ridiculous then dead" is the view of one official. BPA2# 3019

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In an unspecified barbershop, a man receives a shave from a barber in an influenza mask during the ongoing pandemic, Chicago, Illinois, 1918. (Photo by Chicago Sun-Times/Chicago Daily News collection/Chicago History Museum/Getty Images)

In an unspecified barbershop, a man receives a shave from a barber in an influenza mask during the ongoing pandemic, Chicago, Illinois, 1918. (Photo by Chicago Sun-Times/Chicago Daily News collection/Chicago History Museum/Getty Images)

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Women wear cloth surgical-style masks to protect against influenza. A worldwide influenza epidemic killed 20 million people between 1918 and 1920.

Women wear cloth surgical-style masks to protect against influenza. A worldwide influenza epidemic killed 20 million people between 1918 and 1920.

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View of Red Cross staff members, seated at long tables, as they make influenza masks during the ongoing pandemic, Chicago, Illinois, 1918. (Photo by Chicago Sun-Times/Chicago Daily News collection/Chicago History Museum/Getty Images)

View of Red Cross staff members, seated at long tables, as they make influenza masks during the ongoing pandemic, Chicago, Illinois, 1918. (Photo by Chicago Sun-Times/Chicago Daily News collection/Chicago History Museum/Getty Images)