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Check out the companies making headlines before the bell:

Pfizer (PFE), BioNTech (BNTX) – The companies said studies showed that three doses of their Covid-19 vaccine neutralized the omicron variant, while two doses still offered protection. Pfizer and BioNTech also said they're continuing to work on an omicron-specific vaccine. Pfizer and BioNTech came well off earlier premarket lows on the news, with Pfizer up 1.4% and BioNTech trimming its loss to 1.5%.

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