Adults older than 50 years of age and those 18 and older who are immunocompromised are now eligible for fourth doses of either Pfizer or Moderna's COVID-19 vaccines.
The US Food and Drug Administration granted emergency use authorizations for both Pfizer and Moderna to offer the second booster — and fourth shot overall — to these populations. Many top infectious disease experts questioned the need before the agency's decision.
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Cite this: Do You Think a Fourth COVID Shot Is Necessary? - Medscape - Apr 06, 2022.
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