Vaccine Makers Fall After RFK Jr. Says Some Shots Don’t Work (1)

Shares of vaccine makers fell after US Health and Human Services Secretary Robert F. Kennedy Jr.raised doubts about the efficacy of a certain type of Covid vaccine.

Novavax Inc., which is seeking full approval of a shot Kennedy said might not be effective, plunged as much as 26% Thursday, the most since July. Rivals who make a different type of vaccine also saw their shares fall, with Moderna Inc. down as much as 11% and Pfizer Inc. falling 6.2%

In an interview with CBS News released Wednesday, Kennedy was asked about a delay in the approval of the ...