The decision by the Food and Drug Administration paves the way for boosters of all three authorized shots to be available to a wide swath of the U.S. population and promises to ease the logistics of the booster campaign for pharmacies and clinics offering vaccines…

The Johnson & Johnson booster was authorized for anyone 18 and over — a broad eligibility criteria reflecting the lower protection of the initial single-shot regimen when compared with other coronavirus vaccines. The Moderna booster, a half-dose of the original shot, was authorized for people 65 and older, or adults at risk of severe illness or complications because of underlying medical conditions or exposure on the job.

That means someone who received the Johnson & Johnson product can get a booster dose with Moderna or Pfizer-BioNTech, as long as the person is 18 or older, meeting the criteria to get a booster. And someone who has been fully vaccinated with Moderna could get a booster with Johnson & Johnson or Pfizer, if they are older than 65 or older, or at high risk.