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Covid-19 vaccines: Two doses of Pfizer and Moderna s vaccines are necessary, officials say, but questions still linger CNN 3/4/2021 By Jen Christensen, CNN © APU GOMES/AFP/AFP via Getty Images Medical worker Robert Gilbertson loads a syringe with the Moderna Covid-19 vaccine to be administered by nurses at a vaccination site at Kedren Community Health Center, in South Central Los Angeles, California on February 16, 2021. (Photo by Apu GOMES / AFP) (Photo by APU GOMES/AFP via Getty Images) The United States is holding firm to the strategy to administer two doses of the Moderna and Pfizer/BioNTech Covid-19 vaccines a few weeks apart. Still, the idea of expanding the supply by dispensing only one dose hasn t faded away.

United statesUnited kingdomApu gomesAnthony fauciClaudio santana gettyRobert gilbertsonLos angelesModerna covidBiontech covidJerome adamsAbdon cifuentesHeather scobieViktor orbanNational institute of allergyDrug administrationHealth ministry