CDC study finds side effects from COVID-19 vaccine booster are the same as after second shot

Side effects reported after a third dose of a COVID-19 vaccine from Pfizer or Moderna so far appear similar to the second dose, the Centers for Disease Control and Prevention said Wednesday, suggesting "no unexpected patterns of adverse reactions" from the booster shot, based on early data on use of the shots in the real world. ...

Like with the second dose, the agency said most side effects reported by recipients of a third dose of the mRNA vaccines "were mild or moderate." Most were reported to occur on the day after vaccination.  ...