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Will you need a third vaccine dose? Drugmakers test tweaked vaccine against variants Lauren Neergaard AP Medical Writer Dozens of Americans are rolling up their sleeves for a third dose of COVID-19 vaccine this time, shots tweaked to guard against a worrisome mutated version of the virus. Make no mistake: The vaccines currently being rolled out across the U.S. offer strong protection. But new studies of experimental updates to the Moderna and Pfizer vaccines mark a critical first step toward an alternative if the virus eventually outsmarts today s shots. We need to be ahead of the virus, said Dr. Nadine Rouphael of Emory University, who is helping to lead a study of Moderna s tweaked candidate. We know what it s like when we re behind.

South africaUnited statesUnited kingdomSouth africanLauren neergaardPaul offitCole smithNadine rouphaelCenters for diseaseEmory universityNational institutes of healthDrug administrationAssociated pressDisease controlNational institutesஒன்றுபட்டது மாநிலங்களில்