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Pfizer seeks approval for 4th COVID-19 booster dose for seniors
A healthcare worker prepares the Pfizer-BioNTech (Comirnaty) COVID-19 vaccine. (Pongmanat Tasiri/SOPA Images/LightRocket via Getty Images) WASHINGTON - Drugmaker Pfizer is expected to request authorization this week for an additional COVID-19 booster dose for seniors, according to a person familiar with the matter.It would add a fourth dose to the regimen, which currently consists of a primary series of two shots, followed months later by a booster dose, in an effort to provide maximum protection to the over-65 population that has been hit hardest by the pandemic.RELATED: Pfizer CEO: 4th shot of vaccine 'necessary'The Food and Drug Administration and the Centers for Disease Control must approve the request.