Is severe COVID linked to leaky-gut plasma markers?
Severe COVID-19 showed higher tight-junction permeability and bacterial/fungal translocation markers that tracked systemic inflammation; zonulin was higher in patients who later died.
Source
Plasma Markers of Disrupted Gut Permeability in Severe COVID-19 Patients
Study at a glance
- Design
- Cross-sectional — Multi-omic plasma comparison across COVID severity strata plus validation cohort
- N
- N=80 · Main cohort: 60 COVID+ (20 mild/20 moderate/20 severe) + 20 negative controls; markers validated in additional samples
- Population
- Adults with mild–severe COVID-19 and SARS-CoV-2–negative controls (RUMC)
- Outcome
- Plasma gut-permeability and microbial translocation markers vs COVID severity
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Inspect source passages
Is severe COVID linked to leaky-gut plasma markers?
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
Main cohort 60 COVID+ and 20 controls.
Main analyses were performed using plasma samples from 60 individuals tested positive for SARS-CoV-2 and 20 SARS-CoV-2 negative controls collected at Rush University Medical Center (RUMC).
Zonulin higher in deaths among hospitalized (n=8 vs 32 survivors).
Zonulin levels are higher in hospitalized COVID patients (n=40) who eventually died from COVID-19 (n=8) compared to survivors (n=32).
What they did
Compared multi-omic plasma profiles from 60 SARS-CoV-2–positive patients (mild/moderate/severe) and 20 negative controls, focusing on gut barrier, translocation, inflammation, metabolome, lipidome, and glycome; key markers validated in an independent cohort.
What they found
Severe disease associated with elevated tight-junction permeability and microbial product translocation markers correlating with inflammation. Plasma zonulin was higher in moderate/severe vs mild/controls and higher among hospitalized patients who died (8/40) vs survivors.
The limits
What it doesn't show
Associations do not prove gut leak causes severe COVID; timing at admission cannot establish sequence, and samples are from selected clinical strata.
Key terms
- Gut permeability
- Impaired intestinal barrier allowing microbial products into blood.
- Zonulin
- Plasma marker linked to tight-junction regulation/permeability.
- Microbial translocation
- Movement of bacterial/fungal products into circulation.
- LBP
- LPS-binding protein reflecting bacterial product exposure.
- sCD14
- Soluble CD14 marker of myeloid activation/translocation.
- Multi-omics
- Combined metabolomic, lipidomic, glycomic, and marker assays.
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ICU-severe group size in main cohort?
Common questions
Main cohort size?
60 COVID+ and 20 controls.
Severity strata?
20 mild, 20 moderate, 20 ICU-severe.
Key permeability marker?
Plasma zonulin elevated in worse disease/death.
Causal?
No—associative multi-omic evidence only.
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