Long COVID Follow-up Survey Study

During July 2021‒March 2022, all 4,800 positive COVID-19 test results reported during August 2020‒February 2022 were followed up with confidential electronic surveys sent to each patient at least 28 days after their initial positive result that included questions about long COVID. Those data were merged with the COVID-19 case investigation data.
For the long COVID follow-up survey data collection, we determined that 143 persons had >2 COVID-19 diagnoses during August 2020‒February 2022; those persons were only included once in the long COVID follow-up data collection, resulting in a total of 4,657 persons who were COVID-19 positive during the study period. The follow-up survey had a response rate of 32% (1,482/4,657). We observed major differences in age, university affiliation, underlying conditions, and vaccination status at the time of test between follow-up survey respondents and nonrespondents (Appendix 1). A total of 11 respondents completed the follow-up survey twice but were only counted once for the response rate. Not all responses were usable in the final analysis: 141 did not have a complete initial case investigation, and 3 did not provide responses to the survey questions about long COVID, removing them from the final sample. Thus, the final analytic sample consisted of 1,338 respondents (Table 1).