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FILE - In this Thursday, Aug. 26, 2021 file photo, a syringe is prepared with the Pfizer COVID-19 vaccine at a mobile vaccine clinic in Santa Ana, Calif. New U.S. studies released on Friday, Sept. 10, 2021 show COVID-19 vaccines remain highly effective, especially against hospitalizations and death, even against the extra-contagious delta variant. (AP Photo/Jae C. Hong)