The study was conducted in the Emergency and Pediatric Departments at Schneider Children’s Medical Center between May 20, 2021, and August 31, 2021. Infants born to mothers who had been vaccinated with the BNT162b2 COVID-19 vaccine during pregnancy were eligible to participate. Following informed consent, residual sera from the infants’ blood samples that were taken as part of medical evaluations were collected and stored. Mothers who escorted their infants during the visits were offered to participate as well; following consent, blood was drawn from the mothers and examined for the study. The study was approved by the Committee for Human Studies of the Medical Center.
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