Experiments with chlorine gas for influenza immunizations in United States. A World War I tank sprays gas in a field. View of American soldiers during 1917 to 1918 period of World War I, in a trench, wearing gas masks, and firing rifles at enemy positions. Post war tests on use of Chlorine gas to control the flu (emerging from 1918 Spanish Flu epidemic), inspired by low rate of influenza among United States soldiers exposed to chlorine gas during the war. Man enters a chlorine chamber at the Chemical Warfare Service. A chart on the wall showing results on symptoms after exposure in chlorine chamber. A woman in 1920s hat carrying a tissue is treated with chlorine gas. A testing apparatus on a table. Group of patients sit together in a chlorine chamber being exposed to the chlorine gas. A business man in a suit receives a portable chlorine gas treatment in his office as he is too busy to visit the chlorine chamber.
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