Moderna Says Booster COVID-19 Shots May Be Required, Citing New Data on Breakthrough Cases

Moderna Says Booster COVID-19 Shots May Be Required, Citing New Data on Breakthrough Cases
A person holds a vial of Moderna COVID-19 vaccine on June 29, 2021. Fred Tanneau/AFP via Getty Images
Updated:

Moderna announced on Wednesday that its COVID-19 vaccine decreases in efficacy after a year, suggesting a potential benefit in having a booster shot of its mRNA vaccine.

New clinical trial data showed that breakthrough COVID-19 infections are less common among people who received Moderna’s vaccine, mRNA-1273, more recently compared to less recently, the company said in a release.
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