A new CDC-led study finds Pfizer and J&J vaccines protect people well, but Moderna's vaccine is slightly more effective in keeping people out of the hospital

A head-to-head study of all three authorized coronavirus vaccines in the United States finds the Moderna vaccine is slightly more effective than Pfizer's in real-life use in keeping people out of the hospital, and Johnson & Johnson's Janssen vaccine comes in third, but still providing 71% protection.

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