Estiri, Hossein, Strasser, Zachary H, Brat, Gabriel A et al. · BMC medicine · 2021 · DOI
This study looked at medical records from over 96,000 people to identify which health problems are more common in people who had COVID-19 compared to those who didn't. Researchers found that certain symptoms and conditions—including loss of taste and smell, hair loss, chest pain, extreme tiredness, shortness of breath, pneumonia, and new-onset diabetes—appear more frequently in COVID-19 survivors months after infection. Younger people under 65 developed more of these long-term problems than older adults.
This large-scale study identifies a broad spectrum of long COVID phenotypes, including some overlapping with ME/CFS such as chronic fatigue and neurological symptoms, providing empirical support for characterizing post-COVID conditions. The finding that younger adults experience disproportionately more long-term sequelae has important implications for understanding ME/CFS-like post-viral illness risk across age groups. The emphasis on vaccination to prevent these debilitating conditions underscores the relevance for both clinical management and public health policy in post-viral disease prevention.
This study does not establish causal mechanisms—it shows temporal association between COVID-19 and new diagnoses but cannot determine whether COVID-19 directly caused these conditions or whether they represent coincidental new diagnoses. The reliance on EHR documentation means some conditions may be underreported or missed if patients did not seek care. The study also does not compare severity or phenotypic overlap between post-COVID fatigue and ME/CFS diagnostic criteria, so claims about ME/CFS specifically should be viewed cautiously.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
The first block is for the primary paper and is the citation you should use in research work. The atlas-snapshot line only applies if you are specifically referring to this atlas’s reading of the paper on the date shown.
Primary citation
Estiri, Hossein, Strasser, Zachary H, Brat, Gabriel A, Semenov, Yevgeniy R, Consortium for Characterization of COVID-19 by EHR (4CE), Patel, Chirag J, et al. (2021). Evolving phenotypes of non-hospitalized patients that indicate long COVID.. BMC medicine. https://doi.org/10.1186/s12916-021-02115-0
BibTeX
@article{mecfsatlas-estiri-2021-evolving-phenotypes,
author = {Estiri, Hossein and Strasser, Zachary H and Brat, Gabriel A and Semenov, Yevgeniy R and Consortium for Characterization of COVID-19 by EHR (4CE) and Patel, Chirag J and Murphy, Shawn N},
title = {Evolving phenotypes of non-hospitalized patients that indicate long COVID.},
journal = {BMC medicine},
year = {2021},
doi = {10.1186/s12916-021-02115-0},
note = {PubMed: 34565368},
url = {https://www.mecfsatlas.com/evidence/estiri-2021-evolving-phenotypes},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-30. https://www.mecfsatlas.com/evidence/estiri-2021-evolving-phenotypes
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