[Individuals with sub-health status have obviously unbalanced structure of the intestinal flora: analysis of 150 nursing staff members]. — ME/CFS Atlas
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[Individuals with sub-health status have obviously unbalanced structure of the intestinal flora: analysis of 150 nursing staff members].
Zhang, X, Cai, W, Liao, S et al. · Nan fang yi ke da xue xue bao = Journal of Southern Medical University · 2021 · DOI
Quick Summary
This study compared the gut bacteria of 75 nursing staff members with sub-health status (feeling unwell without a specific diagnosis) to 75 healthy staff members. Researchers found that people with sub-health status had a different balance of gut bacteria compared to healthy people, with greater diversity in bacterial types but an overall imbalance in their gut microbial community.
Why It Matters
Gut microbiota dysbiosis has been implicated in chronic illness and fatigue states. Understanding whether individuals with sub-health status—a condition characterized by unexplained symptoms similar to those in ME/CFS—have distinct microbial signatures could inform future research into whether microbiome modifications might benefit ME/CFS patients experiencing similar symptom profiles.
Observed Findings
Sub-health individuals had significantly higher Shannon diversity index compared to healthy controls (P<0.001)
Significant differences in microbial community structure between groups (β-diversity, P=0.001)
No significant difference in richness (Chao1 index) between sub-health and control groups (P=0.619)
Significant differences in relative abundance of bacteria across 4 phyla, 3 classes, 3 orders, 3 families, and 3 genera (P<0.05)
Both groups shared the same dominant bacterial phyla and genera, but in different proportions
Inferred Conclusions
Individuals with sub-health status have an imbalanced gut microbiota structure despite similar species richness to healthy individuals
Microbiota diversity increases in sub-health status, suggesting dysbiosis rather than simple depletion
The altered microbial composition may be associated with the development or maintenance of sub-health status
Remaining Questions
Does the altered microbiota in sub-health individuals contribute to symptom generation, or is it a consequence of the condition?
How does sub-health microbiota compare to microbiota in defined ME/CFS or other chronic fatigue conditions?
What This Study Does Not Prove
This study does not establish causation—it is unclear whether the altered microbiota composition causes sub-health status or results from it. The study examines only nursing staff, limiting generalizability to other populations. Additionally, sub-health status is not ME/CFS, and findings may not directly apply to clinically defined ME/CFS patients.
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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