Pfizer/BioNTech said Thursday that the COVID-19 vaccine offers protection that lasts six months after the second dose, according to ongoing research for their Phase 3 clinical trial.   The vaccine is 91% effective against disease with any symptoms for half a year and offers protection against the South African variant of the virus called B.1.351.   'The vaccine was 100% effective against severe disease as defined by the U.S. Centers for Disease Control and Prevention (CDC), and 95.3% effective against severe COVID-19 as defined by the U.S. Food and Drug Administration (FDA),' Pfizer and BioNTech said in a statement to CNN.   RELATED: […]

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