St. Louis, (Missouri) Red Cross Motor Corps on duty during the Spanish Influenza epidemic, 1918. Photograph shows mask-wearing woman holding stretchers at backs of ambulances.

St. Louis, (Missouri) Red Cross Motor Corps on duty during the Spanish Influenza epidemic, 1918. Photograph shows mask-wearing woman holding stretchers at backs of ambulances.

St. Louis, (Missouri) Red Cross Motor Corps on duty during the Spanish Influenza epidemic, 1918. Photograph shows mask-wearing woman holding stretchers at backs of ambulances. (Photo by: Universal History Archive/UIG via Getty Images)