The Centers for Disease Control and Prevention recommended on Tuesday that a newly authorized vaccine from Novavax be used as an option for adults seeking a primary immunization against the coronavirus.
Dr. Rochelle Walensky, the C.D.C.’s director, signed off on the recommendation of a panel of vaccine experts that had unanimously endorsed the vaccine on Tuesday afternoon. The decision removes the final regulatory hurdle for the fourth Covid-19 shot authorized in the United States.