Two doses of Pfizer and Moderna’s Covid-19 vaccine are necessary, officials say, but questions still linger
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. The Trump administration’s surgeon general, Dr. Jerome Adams, said in a tweet on Tuesday that the
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