U.S. Bets on Covid-19 Boosters’ Efficacy Against a Changing Virus, as Doses Roll Out

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U.S. Bets on Covid-19 Boosters’ Efficacy Against a Changing Virus, as Doses Roll Out
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U.S. health officials are betting that the current formulations of Covid-19 vaccines and boosters can keep driving down case counts and fight off contagious strains like Delta

current mix of vaccines and boosters

will keep Covid-19 cases trending downward and fend off the contagious Delta variant, though the shots were developed to target the original virus. After exploring whether Covid-19 vaccines need to be reformulated to fight variants like Delta, U.S. health officials said they decided already available doses should work.

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