Pfizer says its tweaked COVID-19 shots boost protection against the omicron variant

https://www.npr.org/2022/06/25/ [login to see] /covid-pfizer-omicron-vaccine
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 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.