CDC advisers recommend Moderna and Johnson & Johnson boosters; say shot can differ from original

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Approximately 105 million, or about 66 percent of fully vaccinated people, have received the two-shot Pfizer series, according to the CDC. About 70 million, or about 37 percent of fully vaccinated people, have received the Moderna series. Only 15 million Americans, or about 8 percent, were vaccinated with Johnson & Johnson shots, which arrived later and were delayed by an investigation of a rare adverse event, as well as a manufacturing problem.

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