Prognosis

The U.S. Has Vaccinated Half Its Seniors. The Next Half Will Be Harder

Residents receive the Covid-19 vaccine at a retirement home.Photographer: Saul Martinez/Bloomberg
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More than half of Americans 65 years old and over have gotten a Covid-19 vaccination, but lingering hesitancy means inoculating the country’s most vulnerable age group is about to get much harder.

At least 27.5 million of the 54.1 million Americans in that age group have received at least one dose, according to the latest update Thursday from the U.S. Centers for Disease Control and Prevention.