• Reuters

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Pfizer Inc and BioNTech SE said on Tuesday they started a clinical trial to test a new version of their vaccine specifically designed to target the COVID-19 omicron variant, which has eluded some of the protection provided by the original two-dose vaccine regimen.

Banking on volunteers in the United States, the companies plan to test the immune response generated by the omicron-based vaccine both as a three-shot regimen in unvaccinated people and as a booster shot for people who already received two doses of their original vaccine.

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