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Study shows Pfizer COVID-19 vaccine effectiveness declines after six months https://t.co/cZzC39HOpu pic.twitter.com/nQOjP762lo— The Hill (@thehill) October 5, 2021
Study shows Pfizer COVID-19 vaccine effectiveness declines after six months https://t.co/cZzC39HOpu pic.twitter.com/nQOjP762lo