"A panel of independent medical experts on Thursday unanimously recommended Moderna booster shots for many of those who had received the company's coronavirus vaccine, paving the way to sharply expand the number of people eligible for an additional shot in the United States."

"Moderna’s potency has held up better than Pfizer’s over time. Unlike Pfizer, the company did not contend that recipients of its vaccine needed a booster to prevent severe disease or hospitalization, instead concentrating its arguments on preventing infection."