FACT CHECK: How effective is the Johnson & Johnson vaccine? The numbers don't tell the whole story

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Mar 04, 2021 FACT CHECK: How effective is the Johnson & Johnson vaccine? The numbers don't tell the whole story At first glance, the Johnson & Johnson Covid-19 vaccine looks to be the inferior option compared to the other approved options from Pfizer-BioNTech and Moderna, both of which reported around 95 percent effectiveness in their Phase 3 clinical trials. But Johnson & Johnson's single-dose shot, which has 72 percent effectiveness, isn't necessarily inferior. Here's why. Read More Get the NBC News Mobile App Follow NBC News Check out all of NBCNEWS Newsletters here. Update Preferences | Unsubscribe | Contact | Privacy Update Preferences Unsubscribe Contact Privacy