In fi­nal analy­sis, J&J's un­der­dog vac­cine of­fers on­ly 52.9% pro­tec­tion against Covid-19

It’s long been es­tab­lished that the sin­gle-shot vac­cine pro­duced by J&J is nowhere near as ef­fec­tive as two dos­es of the mR­NA vac­cine — ini­tial­ly viewed …

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