Earlier this month, researchers with Imperial College London’s national coronavirus testing programme determined that the effectiveness of existing vaccines in stopping the Delta strain of Covid has dropped from 64 to 49 percent in recent weeks, with protection against symptoms declining from 83 percent to 59 percent during the same period.
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Wednesday, August 11, 2021
Co-Creator of AstraZeneca’s Covid Vaccine Says Delta Variant Has Made Herd Immunity Impossible
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