In critically ill sepsis patients receiving broad-spectrum antibiotics, fecal microbiota transplantation reduces the predicted pathogenic potential of the gut microbiome by lowering levels of microbial taxa linked to inflammation and infection, while probiotics do not reduce this potential.
See the scientific wording
In critically ill sepsis patients on broad-spectrum antibiotics, fecal microbiota transplantation significantly reduces the predicted pathogenic potential of the gut microbiome as measured by BugBase analysis (p=0.021) by suppressing taxa associated with inflammation and infection, whereas probiotics do not produce this effect.
Very strong evidence
Randomized trialsOne good-quality study supports this claim.
What the research says
1 study reviewedSupporting (1)
Randomized Controlled TrialHuman2026
In very sick septic patients on strong antibiotics, giving them a fecal transplant helped fix their gut bacteria and made the harmful ones less likely to cause trouble, while probiotics didn’t do anything. The study showed this using a computer tool that predicts how dangerous the gut bacteria are.
Contradicting (0)
No contradicting studies found yet
That doesn't mean it's settled — it just means no study has tested the opposite.
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A transplant of healthy gut bacteria from a donor introduces diverse microbes that survive antibiotics and take over space and resources in the gut, pushing out harmful bacteria that cause infection and inflammation. Probiotics fail because they are too few and too weak to survive the antibiotics and cannot compete with the harmful bacteria that grow back.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting study
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In critically ill sepsis patients receiving broad-spectrum antibiotics, fecal microbiota transplantation reduces the predicted pathogenic potential of the gut microbiome by lowering levels of microbial taxa linked to inflammation and infection, while probiotics do not reduce this potential.
Mechanism
1 studyHealthy gut bacteria from a donor can survive antibiotics and take over the gut, pushing out dangerous bacteria. Probiotics from pills cannot do this because antibiotics kill the helper microbes they need to survive, so the harmful bacteria win.
A transplant of healthy gut bacteria from a donor introduces diverse microbes that survive antibiotics and take over space and resources in the gut, pushing out harmful bacteria that cause infection and inflammation. Probiotics fail because they are too few and too weak to survive the antibiotics and cannot compete with the harmful bacteria that grow back.
A suspension of diverse, viable gut microbes from a healthy donor is introduced into the intestine.
Donor-derived keystone taxa, particularly Bacteroides, establish stable colonization in the gut lumen despite ongoing antibiotic exposure.
Engrafted beneficial microbes outcompete opportunistic pathogens such as Enterobacteriaceae for nutrients and physical niches, and produce metabolites that inhibit their growth.
Microbial diversity increases and the community structure shifts toward a stable, resilient state that restores colonization resistance.
The suppression of pathogenic taxa reduces the overall predicted pathogenic potential of the gut microbiome as measured by functional profiling tools.
Less supported by current evidence, but not ruled out
Oral probiotics introduced during antibiotic treatment cannot establish themselves in the gut because the antibiotics kill off the native microbes that would normally help them survive, leaving harmful bacteria to dominate unchecked.
Limited strains of live bacteria are ingested orally and enter the antibiotic-exposed gut lumen.
Broad-spectrum antibiotics eliminate commensal bacteria that provide metabolic support and ecological niches necessary for probiotic survival.
Probiotic strains fail to colonize and are cleared from the gut without establishing a persistent population.
The absence of microbial restructuring allows opportunistic pathogens to expand due to loss of competitive inhibition.
Evidence from Studies
Supporting (1)
Community contributions welcome
Effects of fecal microbiota transplantation and probiotics on the gut microbiome in antibiotic-treated septic patients: A pilot randomized controlled trial
In very sick septic patients on strong antibiotics, giving them a fecal transplant helped fix their gut bacteria and made the harmful ones less likely to cause trouble, while probiotics didn’t do anything. The study showed this using a computer tool that predicts how dangerous the gut bacteria are.
Contradicting (0)
Community contributions welcome
Score Breakdown
No multi-axis breakdown available yet. The overall Pro / Against score above is the best signal.
- No clinical evidence is available; the score reflects mechanistic plausibility only.
What Would Prove This
Per GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this claim, ordered from strongest to weakest.
Systematic Review and Meta-Analysis of Fecal Microbiota Transplantation vs Probiotics for Gut Microbiome Pathogenic Potential in Critically Ill Sepsis Patients
Population: Critically ill sepsis patients on broad-spectrum antibiotics; Intervention: Fecal microbiota transplantation; Comparator: Probiotics or placebo; Outcome: Change in BugBase-predicted pathogenic potential; Duration: At least 14 days post-intervention
Double-Blind Randomized Controlled Trial of Fecal Microbiota Transplantation vs Probiotics on Gut Microbiome Pathogenic Potential in Critically Ill Sepsis Patients
Population: Critically ill sepsis patients on broad-spectrum antibiotics; Intervention: Fecal microbiota transplantation; Comparator: Probiotics; Outcome: Change in BugBase-predicted pathogenic potential; Duration: 14 days
Prospective Cohort Study Comparing Gut Microbiome Pathogenic Potential in Critically Ill Sepsis Patients Receiving Fecal Microbiota Transplantation vs Probiotics
Population: Critically ill sepsis patients on broad-spectrum antibiotics; Exposure: Fecal microbiota transplantation or probiotics; Outcome: Change in BugBase-predicted pathogenic potential; Duration: 14–28 days
Case-Control Study of Gut Microbiome Pathogenic Potential in Critically Ill Sepsis Patients with and without Fecal Microbiota Transplantation
Population: Critically ill sepsis patients on broad-spectrum antibiotics; Cases: Patients receiving fecal microbiota transplantation; Controls: Patients receiving probiotics; Outcome: BugBase-predicted pathogenic potential at day 14; Duration: Single time point post-intervention
In Vitro Analysis of Fecal Microbiota Transplantation Supernatants on Inflammatory Pathway Activation in Human Intestinal Epithelial Cells
Population: Human intestinal epithelial cell lines; Intervention: Exposure to fecal microbiota transplantation supernatant; Comparator: Probiotic supernatant or sterile media; Outcome: Expression of inflammatory markers and pathogenicity gene signatures; Duration: 24–72 hours