augieray, STUDY finds that #COVID19 vaccine effectiveness (VE) was 78% and increased to 89% after boosting during the Delta-dominant study period, but VE of primary vaccination was significantly reduced in those aged 60+ and patients with malignancy, chronic cardiac disease or an immunocompromising condition.
https://www.sciencedirect.com/science/article/abs/pii/S0264410X24004328
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