Key Points Question What is the association between COVID-19 testing and case rates on residential college campuses? Findings In this cohort study of 18 Connecticut colleges and universities, infrequent COVID-19 testing of residential students was not associated with decreased transmission, whereas testing of residential students twice per week was associated with decreased transmission during the 2020-2021 academic year. Meaning Findings suggest that twice-weekly COVID-19 testing of residential students may serve as an effective infection mitigation strategy at colleges and universities. Importance During the 2020-2021 academic year, many institutions of higher education reopened to residential students while pursuing strategies to mitigate the risk of SARS-CoV-2 transmission on campus. Reopening guidance emphasized polymerase chain reaction or antigen testing for residential students and social distancing measures to reduce the frequency of close interpersonal contact, and Connecticut colleges and universities used a variety of approaches to reopen campuses to residential students. Objective To characterize institutional reopening strategies and COVID-19 outcomes in 18 residential college and university campuses across Connecticut. Design, Setting, and Participants This retrospective cohort study used data on COVID-19 testing and cases and social contact from 18 college and university campuses in Connecticut that had residential students during the 2020-2021 academic year. Exposures Tests for COVID-19 performed per week per residential student. Main Outcomes and Measures Cases per week per residential student and mean (95% CI) social contact per week per residential student. Results Between 235 and 4603 residential students attended the fall semester across each of 18 institutions of higher education in Connecticut, with fewer residential students at most institutions during the spring semester. In census block groups containing residence halls, the fall student move-in resulted in a 475% (95% CI, 373%-606%) increase in mean contact, and the spring move-in resulted in a 561% (95% CI, 441%-713%) increase in mean contact compared with the 7 weeks prior to move-in. The association between test frequency and case rate per residential student was complex; institutions that tested students infrequently detected few cases but failed to blunt transmission, whereas institutions that tested students more frequently detected more cases and prevented further spread. In fall 2020, each additional test per student per week was associated with a decrease of 0.0014 cases per student per week (95% CI, –0.0028 to –0.00001). Conclusions and Relevance The findings of this cohort study suggest that, in the era of available vaccinations and highly transmissible SARS-CoV-2 variants, colleges and universities should continue to test residential students and use mitigation strategies to control on-campus COVID-19 cases. This cohort study assesses the associations between COVID-19 testing and case rates and social contact to characterize reopening strategies for residential students at college and university campuses in Connecticut.
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