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In this photo provided by Cincinnati Children’s Hospital Medical Center, clinical research coordinator Tammy Lewis-McCauley administers an injection to Katelyn Evans, a trial participant, as part of the hospital’s clinical trial of Pfizer's COVID-19 vaccine at Cincinnati Children’s Hospital Medical Center on Wednesday, Oct. 14, 2020. (Cincinnati Children’s Hospital Medical Center via AP)

In this photo provided by Cincinnati Children’s Hospital Medical Center, clinical research coordinator Tammy Lewis-McCauley administers an injection to Katelyn Evans, a trial participant, as part of the hospital’s clinical trial of Pfizer's COVID-19 vaccine at Cincinnati Children’s Hospital Medical Center on Wednesday, Oct. 14, 2020. (Cincinnati Children’s Hospital Medical Center via AP)

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