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A medical staff holds a syringe while the German company CureVac vaccine is being investigated for coronavirus disease at the Amsterdam UMC hospital in Amsterdam, on January 11, 2020. - The hospital is looking for two thousand volunteers for research into this vaccine, in which the vaccine or a placebo is administered. (Photo by Jeroen JUMELET / ANP / AFP) / Netherlands OUT (KEYSTONE/ANP/JEROEN JUMELET)