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Pfizer says tweaked COVID-19 shots boost omicron protection

1 month ago   |   By Boston Herald

Pfizer announced 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 gotten a booster dose. But those vaccines target the original coronavirus strain and their effectiveness against any infection dropped markedly when the super-contagious omicron mutant emerged.
Now with omicron's even more transmissible relatives...
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