After an initial increase in Omicron-specific antibodies after the second Pfizer shot, levels dropped rapidly, from 76.2% at week 4, to 53.3% at weeks 8 to 10, and 18.9% at weeks 12 to 14.
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https://childrenshealthdefense.org/defender/pfizer-booster-covid-vaccine-wane/
Second and third doses of Pfizer’s COVID-19 vaccine provide protection against the Omicron variant for only a few weeks, according to peer-reviewed research published today in JAMA Network Open.
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