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FILE - This March 1931 file photo shows ampules of the BCG vaccine against tuberculosis in a laboratory at the Institute Pasteur in Paris, France. Dec. 2, 1947 file photo. Scientists are dusting off some decades-old vaccines against TB and polio to see if they could provide stopgap protection against COVID-19 until a more precise shot arrives.  (AP Photo/Alfred Eisenstaedt)

FILE - This March 1931 file photo shows ampules of the BCG vaccine against tuberculosis in a laboratory at the Institute Pasteur in Paris, France. Dec. 2, 1947 file photo. Scientists are dusting off some decades-old vaccines against TB and polio to see if they could provide stopgap protection against COVID-19 until a more precise shot arrives. (AP Photo/Alfred Eisenstaedt)

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