Paul Stoffels, J&J CSO (Andrew Harnik/AP Images)

J&J on track to roll out sin­gle-shot Covid-19 vac­cine in March, Paul Stof­fels con­firms, al­though man­u­fac­tur­ing de­lays raise ques­tions

We should know how ef­fec­tive J&J’s Covid-19 vac­cine — the sin­gle shot that’s clos­est to po­ten­tial au­tho­riza­tion — is by the end of this month or ear­ly …

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