Apr 3, 2022
Pfizer says tweaked COVID-19 shots boost omicron protection
Credit: Pixabay/CC0 Public Domain Pfizer announced Saturday that tweaking its COVID-19 vaccine to better target the omicron variant is safe and works—just days before regulators debate whether to offer Americans updated booster shots this fall. The vaccines currently used in the U.S. still offer strong protection against severe COVID-19 disease and death—especially if people have