The Food and Drug Administration is poised to amend the emergency use authorizations for the Pfizer and the Moderna Covid-19 vaccines Thursday to allow people with compromised immune systems to get a third dose, according to two sources familiar with the plans.
The move would come after a panel of advisers to the Centers for Disease Control and Prevention met in July and urged action on extra doses for immunocompromised adults.
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Doctors say it is increasingly clear that many such patients are still vulnerable to Covid following vaccination because they may not mount an effective immune response to the shots.
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