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A citizen receives COVID-19 test inside the Wiener Stadthalle in Vienna, Austria, Dec. 4, 2020. Vienna's COVID-19 mass tests will last from Dec. 4 to Dec. 13. (Photo by Georges Schneider/Xinhua)
A citizen receives COVID-19 test inside the Wiener Stadthalle in Vienna, Austria, Dec. 4, 2020. Vienna's COVID-19 mass tests will last from Dec. 4 to Dec. 13. (Photo by Georges Schneider/Xinhua)