Post‑COVID‑19 Syndrome in Outpatients: A Cohort Study

Abstract

Background: Some patients experience persistent symptoms after COVID-19, but data on outpatients with mild-to-moderate COVID-19 are scarce. We aimed to describe the post-COVID-19 syndrome in confirmed COVID-19 outpatients and to identify its predictors.Methods: This monocentric prospective cohort study included symptomatic outpatients with PCR-confirmed COVID-19 (COVID-positive) and SARS-CoV-2 negative PCR (COVID-negative). Predefined persistent symptoms were evaluated though a phone interview between more than three to ten months after diagnosis. Associations between long-term symptoms and PCR test result, as well predictors of persistent symptoms in COVID-positive were evaluated by multivariate logistic regression.Findings: The study population consisted mostly of young (median of 41 versus 36 years in COVID-positive and COVID-negative, respectively; p=0·020) health care workers (67% versus 82%; p=0·006). Persistent symptoms were reported by 223 (53%) COVID-positive and 33 (37%) COVID-negative ( p =0·006). Overall, 21% COVID-positive and 15% COVID-negative (p=0·182) consulted a doctor for these symptoms. Four surveyed symptoms were independently associated with COVID-19: fatigue (adjusted odds ratio [aOR] 2·14, 95%CI 1·04-4·41), smell/taste disorder (26·5, 3·46-202), dyspnea (2·81, 1·10-7·16) and memory impairment (5·71, 1·53-21·3). Among COVID-positive, female gender (aOR 1·67, 95% CI 1·09-2·56) and overweight/obesity (1·67, 1·10-2·56) were predictors of persistent symptoms.Interpretation: More than half of COVID-positive outpatients report persistent symptoms up to ten months after infection and 21% seek medical care for this reason. The symptoms and predictors of post-COVID-19 syndrome need further characterization as it places a significant burden on society and especially healthcare systems.Funding: This work was supported by an academic award of the Leenaards Foundation.Declaration of Interests: None to declare. Ethics Approval Statement: The project was approved by the Ethics Committee of the Canton of Vaud, Switzerland. All participants gave their verbal consent to participate in this study during the phone interview (project-ID CER-VD 2020-01107 and 2019-02283).