(CNN)Two Pfizer and BioNTech Covid-19 vaccine boosters updated to target the Omicron variant show a substantially higher immune response than the current Covid-19 vaccine, the companies said Saturday… [read more]
(CNN)Two Pfizer and BioNTech Covid-19 vaccine boosters updated to target the Omicron variant show a substantially higher immune response than the current Covid-19 vaccine, the companies said Saturday… [read more]