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AstraZeneca vaccine faces tough questions in U.S.
The National Institute of Allergy and Infectious Diseases said AstraZeneca's COVID-19 vaccine trial results may include "outdated information," a day after the drugmaker said its shot was 79% effective against the coronavirus and 100% effective at preventing severe disease and hospitalizations. Pediatrician Dr. Dyan Hes spoke with Anne-Marie Green and Vladimir Duthiers about the trial and and several other COVID-19 studies.