Dr. Manjul Shukla transfers Pfizer COVID-19 vaccine into a syringe, Thursday, Dec. 2, 2021, at a mobile vaccination clinic in Worcester, Mass. Pfizer said Wednesday, Dec. 8, 2021, that a booster dose of its COVID-19 vaccine may protect against the new omicron variant even though the initial two doses appear significantly less effective. (AP Photo/Steven Senne, File)
December 8, 2021
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December 10, 2021 7 a.m.
Pfizer says COVID booster offers protection against omicron
Pfizer said Wednesday that a booster of its COVID-19 vaccine may offer important protection against the new omicron variant even though the initial two doses appear significantly less effective.