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Kaiser Permanente research in Southern California published Nov. 25, 2021, in The Lancet Regional Health – Americas confirmed high Moderna COVID-19 vaccine effectiveness up to 5 months after the second dose. Effectiveness was 87% against COVID-19 ...
The vaccine effectiveness (VE) against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection decreased to 66 percent when the delta variant became predominant, according to research published in the Aug. 24 early-release issue of the U.S.