2 doses of J&J give comparable protection to Moderna or Pfizer, and adding a booster to a single shot raised immunity even more, company says

A two-dose version of Johnson & Johnson's coronavirus vaccine provides 94% protection against symptomatic infection, the company said Tuesday -- making a two-dose regimen of J&J's Janssen vaccine comparable to a two-dose regimen of Moderna's or Pfizer's.

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