Vox
1) What are boosters and how do they work? … 2) Which groups will need a booster shot for Covid-19? … 3) Are you more likely to need a booster if you got J&J or Oxford/AstraZeneca than if you got Pfizer or Moderna? … 4) Is it important for your booster shot to match the original vaccine you got? Or can you mix and match? …