- Pfizer says tweaked Covid-19 shots boost omicron protection NBC News
- Pfizer says its tweaked COVID-19 shots boost protection against the omicron variant NPR
- Pfizer and BioNTech Announce Omicron-Adapted COVID-19 Vaccine Candidates Demonstrate High Immune Response Against Omicron Pfizer
- Pfizer and BioNTech say updated Covid-19 boosters show increased immune response against Omicron variant CNN
- Pfizer says updated booster can provide more protection against omicron MarketWatch
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