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AstraZeneca says US trial data shows vaccine 79% effective

Last Updated Mar 22, 2021 at 7:32 am MDT

FILE - In this Feb. 5, 2021, file photo, vials AstraZeneca vaccine ready to be used at the Wellcome Centre in London. (AP Photo/Frank Augstein, File)

LONDON — AstraZeneca says advanced trial data from a U.S. study on its COVID vaccine shows it is 79% effective.

The U.S. study comprised 30,000 volunteers, 20,000 of whom were given the vaccine while the rest got dummy shots. The results were announed Monday.

The early findings from the U.S. study are just one set of information AstraZeneca must submit to the Food and Drug Administration. An FDA advisory committee will publicly debate the evidence behind the shots before the agency decides whether to allow emergency use of the vaccine.

While the AstraZeneca vaccine has been authorized in more than 50 countries worldwide, scientists have been awaiting results of the U.S. study in hopes it will clear up some of the confusion about just how well the shots really work.

The Associated Press