E2 ModerateModerate confidencePEM not requiredLongitudinalPeer-reviewedReviewed
Three-Month Symptom Profiles Among Symptomatic Adults With Positive and Negative Severe Acute Respiratory Syndrome Coronavirus 2 Tests: A Prospective Cohort Study From the INSPIRE Group.
Spatz, Erica S, Gottlieb, Michael, Wisk, Lauren E et al. · Clinical infectious diseases : an official publication of the Infectious Diseases Society of America · 2023 · DOI
Quick Summary
This study followed adults who tested positive or negative for COVID-19 and tracked their symptoms over three months. At the three-month mark, people who had COVID-19 were much more likely to still have symptoms like fatigue, breathing problems, or muscle pain compared to those who tested negative. Importantly, symptoms of post-infectious syndromes (like unrefreshing sleep and fatigue) were common in both groups, suggesting these symptoms can occur even without COVID-19 infection.
Why It Matters
This study is important because it tracks the natural progression of post-COVID symptoms and compares them to similar symptoms in non-infected individuals, helping researchers understand whether long-COVID and ME/CFS share common mechanisms. For ME/CFS patients, this work highlights that post-infectious fatigue and related symptoms are measurable, trackable outcomes worthy of clinical attention and future investigation.
Observed Findings
- At 3 months, 49.8% of COVID+ participants still reported at least one SARS-CoV-2-specific symptom versus 26.7% of COVID- participants.
- Post-infectious syndrome symptoms (fatigue, unrefreshing sleep, muscle/joint pain, dizziness) were similarly prevalent in both COVID+ and COVID- groups at 3 months.
- Upper respiratory/head/ears/nose/throat symptoms were the most common lingering COVID-19 symptom at 3 months (37.3% in COVID+).
- Constitutional symptoms (fever, chills, feeling ill) persisted in 28.8% of COVID+ participants at 3 months.
Inferred Conclusions
- Long-term SARS-CoV-2-specific symptoms are measurable and persist in approximately half of COVID-19 cases at 3 months.
- Post-infectious syndrome symptoms (fatigue, unrefreshing sleep) occur independently of COVID-19 status, suggesting multiple potential triggers.
- The distinction between long COVID and conditions like ME/CFS requires more targeted investigation beyond simple symptom presence.
Remaining Questions
- What mechanisms drive post-infectious syndrome symptoms that appear equally in COVID+ and COVID- groups?
- Do COVID+ participants with persistent symptoms at 3 months develop chronic conditions like ME/CFS, and if so, at what rate?
What This Study Does Not Prove
This study does not prove that COVID-19 causes ME/CFS or that all long-COVID cases develop into ME/CFS. It also does not establish causation for post-infectious syndrome symptoms, since these symptoms appeared equally in COVID-negative participants, suggesting multiple possible etiologies. The three-month timeframe is relatively short for understanding chronic sequelae.
Tags
Symptom:Cognitive DysfunctionUnrefreshing SleepPainFatigueOrthostatic Intolerance
Phenotype:Infection-TriggeredLong COVID Overlap
Method Flag:PEM Not DefinedWeak Case DefinitionMixed Cohort
Metadata
- DOI
- 10.1093/cid/ciac966
- PMID
- 36573005
- Review status
- Editor reviewed
- Evidence level
- Single-study or moderate support from human research
- Last updated
- 12 April 2026
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 →
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