Pfizer says tweaked COVID-19 shots boost omicron protection
A syringe is prepared with the Pfizer COVID-19 vaccine at a vaccination clinic at the Keystone First Wellness Center in Chester, Pa., Dec. 15, 2021. Pfizer says tweaking its COVID-19 vaccine to better target the omicron variant is safe and boosts protection. Saturday, June 25, 2022 announcement comes just days before regulators debate whether to offer Americans updated booster shots this fall. (AP Photo/Matt Rourke, File)
By LAURAN NEERGAARD, AP Medical Writer
Originally Published: June 25, 2022 1:35 p.m.
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