Pfizer/BioNTech, Moderna Vaccines Take Baby Steps Into Booster Shots

Moderna may benefit from data indicating strong efficacy against the Delta strain, though an analyst pointed out that they come with some important caveats.

Adolescent covid vaccination US
The FDA expanded the EUAs for Pfizer/BioNTech and Moderna's COVID-19 vaccines to include third shots for severely immunocompromised individuals • Source: Shutterstock

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