Post-Acute COVID-19 Symptoms Clusters and Work Status.

Publication date: Sep 01, 2026

Long COVID affects an estimated 10-20% of SARS-CoV-2 survivors with heterogeneous, multi-system symptoms persisting for months to years, contributing to significant workforce disruption and reduced functional capacity. This exploratory study identified symptom clusters following SARS-CoV-2 infection, examined associated personal and clinical characteristics, and assessed work status across clusters. Among 273 individuals from a single clinical site, we used baseline surveys to capture long COVID symptoms and 2-week follow-up surveys to assess work status, and applied K-means clustering to identify symptom groupings. Three preliminary clusters emerged: Cluster 1 (“brain fog”), characterized by fatigue (96%), difficulty remembering (97%), and difficulty concentrating (94%); Cluster 2 (“undifferentiated”), with low prevalence across all symptoms; and Cluster 3 (“persistent acute”), marked by cough (92%), congestion (80%), headaches (78%), and body aches (78%). Notably, among Cluster 1 (“brain fog”) respondents, 44% reported not working, and approximately half attributed their work absence to COVID-related symptoms. These hypothesis-generating findings suggest that neurocognitive symptom clusters may be associated with greater work absence in some individuals, though the small number of respondents limits firm conclusions. The findings suggest that targeted occupational rehabilitation strategies may warrant further investigation as potential strategies for individuals experiencing post-infectious cognitive impairment following SARS-CoV-2 infection.

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