Symptom severity in an outbreak of SARS-CoV-2 at a university student gala in the Omicron era, Chicago, Illinois, April 2022

Objective: In April 2022, the University of Illinois Chicago (UIC) COVID-19 Contact Tracing & Epidemiology Program identified an outbreak associated with an indoor student gala. This study's aims were to characterize COVID-19 transmission dynamics and measure symptom severity among cases.Participants: The study population included UIC-affiliated gala attendees. Outbreak-associated cases tested positive for COVID-19 between April 2 and April 11, 2022. Attendees who did not test positive or develop symptoms within ten days of the event were classified as contacts.Methods: We ascertained cases through phone-based contact tracing and a survey and evaluated symptom severity using a novel classification system.Results: Among 307 UIC students registered to attend the gala, the minimum attack rate was 14.0%. Approximately 56% of cases were mildly symptomatic, and 38.9% reported severe symptoms.Conclusions: Our findings align with prior research documenting heightened transmissibility of Omicron-variant-related strains and highlight the need for nuanced symptom assessment methodologies.

Implementation and effectiveness of a COVID-19 case investigation and contact tracing program at a large, urban midwestern university

BACKGROUND

The University of Illinois Chicago (UIC) COVID-19 Contact Tracing and Epidemiology Program was critical to the university's COVID-19 incident response during the 2020-2021 academic year. We are a team of epidemiologists and student contact tracers who perform COVID-19 contact tracing among campus members. Literature is sparse on models for mobilizing non-clinical students as contact tracers; therefore, we aim to disseminate strategies that are adaptable by other institutions.

METHODS

We described essential aspects of our program including surveillance testing, staffing and training models, interdepartmental partnerships, and workflows. Additionally, we analyzed the epidemiology of COVID-19 at UIC and measures of contact tracing effectiveness.

RESULTS

The program was responsible for promptly quarantining 120 cases prior to converting and potentially infecting others, thereby preventing at least 132 downstream exposures and 22 COVID-19 infections from occurring.

DISCUSSION

Features central to program success included routine data translation and dissemination and utilizing students as indigenous campus contact tracers. Major operational challenges included high staff turnover and adjusting to rapidly evolving public health guidance.

CONCLUSIONS

Institutes of higher education provide fertile ground for effective contact tracing, particularly when comprehensive networks of partners facilitate compliance with institution-specific public health requirements.