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Study decoded · health · gut · Emerging
Gut Bacteria Pattern Linked To Severe Hepatitis E In 125 Patients
125 patients studied9 bacteria species flaggedLactate axis identifiedLiver disease link
A metagenomic analysis published in mSystems on September 25, 2026 found that specific gut bacteria patterns tracked with hepatitis E severity in 125 people, with one species, Veillonella atypica, emerging as the strongest marker.
Researchers performed shotgun metagenomic sequencing, a method that reads all the genetic material in a stool sample, on fecal samples from 125 individuals grouped into acute non-icteric hepatitis, acute icteric hepatitis, acute liver failure and healthy controls. They built a severity score from routine blood test results and combined two statistical modeling methods to find which gut bacteria tracked with how sick each patient was. The bacterial pattern distinguished patients from healthy controls with an accuracy score (AUC) of 0.944, where 1.0 would mean perfect separation. Nine bacterial species were tied to severity independent of age, sex and body mass index, with Veillonella atypica standing out as the most consistent marker. A set of 16 core microbial genes explained 61% of the variation in disease severity, compared with 47% explained by a broader, less selective set of genes.
The severity pattern featured more lactate-utilizing bacteria, including Veillonella species and Ligilactobacillus salivarius, alongside fewer beneficial bacteria such as Dorea longicatena, Ruminococcus timonensis and Eubacterium ramulus. The authors describe this as a pathogenic lactate axis, where bacteria that thrive on lactate crowd out species that produce butyrate, a short-chain fatty acid that helps maintain the gut lining. Thirteen bacterial genes tied to oxidative stress handling and biofilm formation rose with severity, while three genes fell, including one involved in making butyrate. In general terms, the gut and liver are closely connected through the bloodstream carrying bacterial byproducts directly to the liver, so shifts in gut bacteria can plausibly influence liver inflammation.
Gut Gene Signature Explains More Variance In Hepatitis E Severity: 61% vs 47%
Data Panel
- Who
- 125 individuals with hepatitis E across four groups: acute non-icteric hepatitis, acute icteric hepatitis, acute liver failure, and healthy controls; age and sex split not reported
- Design
- Observational study using shotgun metagenomic sequencing of fecal samples, with a surrogate severity index built from routine blood parameters and combined machine-learning models (XGBoost and LASSO)
- Dose
- Not applicable; this was an observational microbiome analysis, not an intervention study
- Primary result
- Gut bacteria pattern distinguished patients from healthy controls with an accuracy score (AUC) of 0.944; nine bacterial species were significantly tied to severity independent of age, sex and BMI
- Secondary
- A 16-gene core microbial signature explained 61% of variance in disease severity versus 47% for a broader gene set; 13 severity-increasing genes involved oxidative stress and biofilm formation, 3 severity-decreasing genes included a butyrate-production gene
- Funding / conflicts
- Not reported in the available abstract
This was an observational snapshot of stool samples rather than a trial testing any intervention, so the bacterial pattern cannot be said to cause worse hepatitis E outcomes. Funding and conflict-of-interest information was not reported in the available abstract.
Dr. Axe's Take
The drop in butyrate-making bacteria alongside a rise in lactate-loving species fits a pattern I see across liver and gut conditions generally: when the gut barrier weakens, the liver inherits the burden of filtering what leaks through. I would not wait for a hepatitis diagnosis to act on this. Feeding butyrate producers now, with fiber-rich vegetables, resistant starch from cooked and cooled potatoes or rice, and fermented foods like sauerkraut or kefir, supports the same commensal bacteria this study found depleted in the sickest patients. If you have a liver condition or known hepatitis exposure, keep taking any prescribed treatment exactly as directed and talk with your doctor about monitoring, while you build these gut-supportive foods into your week.
— Dr. Axe