Study: Booster vaccination protection against SARS-CoV-2 infections in young adults during an Omicron BA.1-predominant period: A retrospective cohort study. Image Credit: Jo Panuwat D / Shutterstock
About the study In the present study, the researchers conducted a retrospective, cohort-based analysis of deidentified records of Cornell University students obtained from their COVID-19 surveillance database. Participants were recruited from Cornell University's mandatory surveillance testing implemented for faculty, students, and staff as part of their reopening strategy.
The measured primary outcome was SARS-CoV-2 infection confirmed by a positive PCR test. The person-days for each student were calculated, which was the number of days contributed by each participant to the boosted or non-boosted cohort during the study. The person-days were classified as boosted or control based on whether the booster had been administered at least seven days ago, as other studies had reported that booster vaccines become effective seven days after administration.