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A syringe is prepared with the Pfizer COVID-19 vaccine at a vaccination clinic at the Keystone First Wellness Center in Chester, Pa., on Dec. 15, 2021. Pfizer is expected to request authorization for an additional COVID-19 booster dose for seniors. (AP Photo/Matt Rourke, File)  **FILE**
Photo by: Matt Rourke
A syringe is prepared with the Pfizer COVID-19 vaccine at a vaccination clinic at the Keystone First Wellness Center in Chester, Pa., on Dec. 15, 2021. Pfizer is expected to request authorization for an additional COVID-19 booster dose for seniors. (AP Photo/Matt Rourke, File) **FILE**

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