Long COVID may be a form of chronic fatigue syndrome

Long COVID as a putative subtype of chronic fatigue syndrome

NIH-funded research Massachusetts General Hospital · NIH-11143218

This project looks for shared genetic and immune causes in people with Long COVID and people with chronic fatigue syndrome to explain lingering symptoms.

Quick facts

Grant typeR01 grant
Study typeNIH-funded research
Funding institutionMassachusetts General Hospital NIH-funded
Lab location1 site (Boston, United States)
Project IDNIH-11143218 on NIH RePORTER

What this research studies

From a patient's perspective, the research team will combine genetic and immune data already collected in many hospitals and biobanks to look for common causes between Long COVID and chronic fatigue syndrome (CFS). They will analyze genetic information across a Long COVID working group of 46 cohorts with over 1.5 million people and meta-analyze CFS data from three biobanks totaling about 740,000 participants. The team will also study immune molecules and use a CFS consortium to link biological findings to symptoms. The overall aim is to determine whether Long COVID represents a subtype of CFS and to identify risk factors that explain who develops long-lasting symptoms.

Who could benefit from this research

Good fit: People who have Long COVID (persistent symptoms after SARS-CoV-2 infection) or who have chronic fatigue syndrome would be most relevant to this research.

Not a fit: People without prior COVID-19 infection or without prolonged fatigue/multisystem symptoms are unlikely to benefit directly from this specific work.

Why it matters

Potential benefit: If successful, this work could help doctors recognize shared causes of Long COVID and CFS and guide development of better diagnostics and targeted treatments.

How similar studies have performed: Previous genetic and immune studies have given clues about post-infectious fatigue and Long COVID, but large-scale direct comparisons between Long COVID and CFS at this size are relatively new.

Where this research is happening

Boston, United States

Researchers

About this research

  1. This is an active NIH-funded research project — typically early-stage science, not a clinical trial accepting patient enrollment.
  2. Some NIH-funded labs run parallel clinical studies or seek volunteers for related work. To check, contact the principal investigator or institution listed above.
  3. For full project details, budget, and progress reports, visit the official NIH RePORTER page below.
Last reviewed 2026-06-13 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.