J&J her­alds 66% ef­fi­ca­cy for sin­gle-dose shot, but falls short of mR­NA ri­vals

J&J’s vac­cine is 66% ef­fec­tive at pre­vent­ing symp­to­matic Covid-19, the com­pa­ny an­nounced Fri­day, falling short of the rough­ly 95% ef­fi­ca­cy seen in two-dose mR­NA vac­cines …

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