649925 external_news 1629481889 1629481889 Vaccinated Americans, get ready to roll up your sleeve again. Starting in September, the U.S. will be offering Covid-19 booster shots to all who have received Pfizer and Moderna vaccines. Why would people need a third shot in the first place? M.G. Finn, Professor and Chair, and James A. Carlos Family Chair for Pediatric Technology in the School of Chemistry and Biochemistry, says that's when data shows vaccine immunity starts to drop. "It gives you another wake-up call as an immune system; it says time to make more," Finn said.

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