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Few Americans have received the latest vaccines against the coronavirus: Just over 7 percent of adults and 2 percent of children had received the shot as of Oct. 14, according to a survey presented on Thursday to scientific advisers to the Centers for Disease Control and Prevention.

The uptake is weak even among those most at risk of severe illness. Only one in five people age 75 or older has been vaccinated, along with about 15 percent of those ages 65 to 74, according to the survey of nearly 15,000 people.