A worker passes through the security gate at the Moderna campus in Norwood, Mass., one of the sites where the biotechnology company is manufacturing its COVID-19 vaccine.

A worker passes through the security gate at the Moderna campus in Norwood, Massachusetts on on December 2, 2020, where the biotechnology company is mass producing its Covid-19 vaccine. – The US hopes to have immunized 100 million people against Covid-19 by the end of February, a top official said on December 2, which is approximately 40 percent of the country’s adult population. The push should start within weeks, when vaccines developed by Pfizer-BioNTech and Moderna-NIH are expected to be approved. (Photo by Joseph Prezioso / AFP) (Photo by JOSEPH PREZIOSO/AFP via Getty Images)