Zhang, X, Cai, W, Liao, S et al. · Nan fang yi ke da xue xue bao = Journal of Southern Medical University · 2021 · DOI
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.
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.
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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