As coronavirus case counts continue to plummet across the United States, people’s immunity may be declining, too. Several studies have found that although mRNA booster shots have been successful at preventing hospitalization and death, their effectiveness against infections is waning.
It’s no wonder, then, that late Thursday, Moderna sought emergency use authorization from the Food and Drug Administration for a second booster shot for all adults. The company’s request came just days after Pfizer and BioNTech filed for emergency authorization for a second booster of its coronavirus vaccine for people 65 and older.