A man stands outside Moderna headquarters in Cambridge, Massachusetts on May 18, 2020. - US biotech firm Moderna reported promising early results from the first clinical tests of an experimental vaccine against the novel coronavirus performed on a small number of volunteers. The Cambridge, Massachusetts-based company said the vaccine candidate, mRNA-1273, appeared to produce an immune response in eight people who received it similar to that seen in people convalescing from the virus. (Photo by Joseph Prezioso / AFP) (Photo by JOSEPH PREZIOSO/AFP via Getty Images)

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