SepsisOMV-FERRO-ALINCT07686887
Outer Membrane Vesicle and Ferroptosis-Related Signatures in Sepsis-Associated Acute Lung Injury Caused by Extra-Pulmonary Hypervirulent Klebsiella Pneumoniae
An observational study of Sepsis and Acute Lung Injury(ALI), run by Southeast University, China.
Trial summary
This prospective observational translational cohort study will investigate whether extra-pulmonary infection caused by hypervirulent Klebsiella pneumoniae (hvKP) is associated with an increased risk of sepsis-associated acute lung injury (SALI), compared with infection caused by classical Klebsiella pneumoniae (cKP). Read more about this study
- Who is it for?
- Ages 18 to 85 years
- Conditions the study is for
- Sepsis, Acute Lung Injury(ALI), Klebsiella Pneumoniae Infection
- How many people
- 120 participants
- Where
- No sites listed yet
- Study dates
- 6 Jul 2026to 30 Jul 2030
- How long will I take part?
- 28 Days
- Phase
- Observational
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 85 years
- All sexes
- No healthy volunteers
- Adult, Older adult
Study population: Consecutively enrolled adults with clinically suspected sepsis caused by a presumed extra-pulmonary infection will be recruited from emergency departments, hospital wards, and intensive care units. Baseline blood samples will be collected during early sepsis evaluation, before culture results or bacterial molecular typing are available. The primary analytic cohort will include participants who subsequently meet Sepsis-3 criteria, have microbiologically confirmed extra-pulmonary Klebsiella pneumoniae infection, have no acute lung injury at enrollment, and have an available clinical isolate for molecular characterization. Isolates will be classified as hypervirulent Klebsiella pneumoniae, classical Klebsiella pneumoniae, or indeterminate phenotype according to prespecified virulence-gene criteria. Patients with primary pulmonary infection, non-Klebsiella pneumoniae infection, mixed infection, culture-negative sepsis, or non-infectious diagnoses will not enter the primary analysis.
Who may be able to join
- Age 18-85 years .
- Clinical suspicion of infection with acute organ dysfunction consistent with suspected sepsis at the time of enrollment, as determined by the treating clinical team.
- Presumed extra-pulmonary source of infection at enrollment, including but not limited to hepatobiliary, urinary, intra-abdominal, skin and soft-tissue, vascular catheter-related, or primary bloodstream infection.
- Blood cultures and/or clinically indicated source cultures obtained or ordered as part of routine clinical care.
- Enrollment and first research blood collection completed within 6 hours after initiation of the clinical sepsis evaluation.
- No evidence of acute lung injury at the index time point, according to the protocol-defined criteria.
- Written informed consent obtained from the participant or legally authorized representative, unless an ethics-approved deferred-consent procedure is used.
Who cannot join
- Suspected or confirmed primary pulmonary infection at enrollment, including community-acquired pneumonia, hospital-acquired pneumonia, ventilator-associated pneumonia, or aspiration pneumonia.
- Acute lung injury or acute respiratory distress syndrome present at the index time point.
- Acute cardiogenic pulmonary edema, acute decompensated heart failure, or another condition that would preclude reliable adjudication of subsequent non-cardiogenic acute lung injury.
- Recent inhalation injury, near-drowning, major thoracic trauma, or transfusion-related acute lung injury.
- Previous enrollment in this study.
- Inability to obtain informed consent from the participant or legally authorized representative when deferred-consent procedures are not permitted by the local ethics committee.
Trial locations and contacts
No sites are listed yet. Contact the study team or a site near you to ask about taking part.
About this study
Official title: Circulating Bacterial Outer Membrane Vesicle Signatures and Ferroptosis-Related Biomarkers in Sepsis-Associated Acute Lung Injury Among Patients With Extra-Pulmonary Hypervirulent Klebsiella Pneumoniae Infection: A Prospective Observational Translational Cohort Study
This prospective observational translational cohort study will investigate whether extra-pulmonary infection caused by hypervirulent Klebsiella pneumoniae (hvKP) is associated with an increased risk of sepsis-associated acute lung injury (SALI), compared with infection caused by classical Klebsiella pneumoniae (cKP). The study will further examine whether circulating bacterial outer membrane vesicle (OMV) signals and ferroptosis-related biomarker profiles are associated with subsequent SALI development.
Adults with Sepsis-3 and microbiologically confirmed extra-pulmonary K. pneumoniae infection will be enrolled within 6 hours of sepsis recognition. Patients with acute lung injury at enrollment will be excluded from the primary cohort. Blood samples will be collected at enrollment, 24 hours, and 72 hours. Clinical isolates will undergo molecular characterization to classify infections as hvKP or cKP. The primary outcome will be new-onset SALI within 7 days after enrollment. A nested translational substudy will evaluate the effects of patient-isolate-derived OMVs on human pulmonary microvascular endothelial cells.
The study will not alter antimicrobial therapy, source control, respiratory support, fluid management, or any other aspect of routine clinical care.
Read the detailed description
Sepsis-associated acute lung injury is a major complication of severe extra-pulmonary Gram-negative bacterial infection. Hypervirulent Klebsiella pneumoniae (hvKP) is increasingly recognized as a cause of invasive infection with a high inflammatory burden and a propensity for metastatic spread. Bacterial outer membrane vesicles (OMVs) are biologically active nanoparticles that may transport lipopolysaccharide, virulence-associated molecules, and other inflammatory cargo to distant organs. Experimental evidence suggests that OMV-mediated oxidative stress and ferroptosis-related injury may contribute to pulmonary endothelial dysfunction and acute lung injury; however, the clinical relevance of these mechanisms in patients with extra-pulmonary hvKP sepsis remains unclear.
This prospective multicenter observational translational cohort study will investigate the relationship among molecularly characterized hvKP infection, circulating bacterial OMV-related signals, ferroptosis-related biomarker profiles, and the subsequent development of sepsis-associated acute lung injury. Adults with microbiologically confirmed extra-pulmonary Klebsiella pneumoniae sepsis will be enrolled early after sepsis recognition and followed during the acute phase of illness. Clinical isolates will undergo molecular characterization for prespecified hypervirulence-associated genes and additional strain-level features. Blood specimens collected during routine early follow-up will be processed using standardized procedures for plasma, serum, and peripheral blood mononuclear cell analyses.
The laboratory component will quantify circulating Gram-negative bacterial OMV-related signals in platelet-depleted plasma and evaluate systemic ferroptosis-related biomarker profiles, including lipid peroxidation products, glutathione redox status, iron-related indices, and ferroptosis-associated gene expression. Patient-derived Klebsiella pneumoniae isolates will also be cultured under standardized conditions for OMV isolation and characterization.
A nested translational substudy will compare OMVs derived from representative hvKP and classical Klebsiella pneumoniae isolates. Equal-particle-number OMV preparations will be applied to human pulmonary microvascular endothelial cells to assess lipid peroxidation, ferroptosis-related molecular changes, endothelial barrier integrity, and the in vitro rescue effect of Ferrostatin-1. No investigational intervention will be administered to study participants, and all clinical management will remain at the discretion of the treating physicians.
- Conditions
- Sepsis, Acute Lung Injury(ALI), Klebsiella Pneumoniae Infection, Hypervirulent Klebsiella Pneumoniae Infection
- Keywords
- Hypervirulent Klebsiella pneumoniae, Extra-pulmonary infection, Sepsis-associated acute lung injury, Bacterial outer membrane vesicles, Ferroptosis, Pulmonary microvascular endothelial cells, Lipid peroxidation, Endothelial barrier dysfunction
- Medical subject headings
- Sepsis, Acute Lung Injury
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
| Study group | Role | What they receive |
|---|---|---|
| Cohort 1 Title: Hypervirulent Klebsiella pneumoniae Infection | Cohort 1 Description: Participants with subsequently confirmed extra-pulmonary Klebsiella pneumoniae infection whose clinical isolate carries iucA, iroB, peg-344, rmpA, and rmpA2. | |
| Cohort 2 Title: Classical Klebsiella pneumoniae Infection | Cohort 2 Description: Participants with subsequently confirmed extra-pulmonary Klebsiella pneumoniae infection whose clinical isolate lacks all five prespecified hypervirulence-associated genes: iucA, iroB, peg-344, rmpA, and rmpA2. | |
| Cohort 3 Title: Indeterminate Klebsiella pneumoniae Molecular Phenotype | Cohort 3 Description: Participants with subsequently confirmed extra-pulmonary Klebsiella pneumoniae infection whose clinical isolate carries one to four of the five prespecified hypervirulence-associated genes. This cohort will be included in exploratory analyses only. |
What is being measured
The primary outcome is the main question the study is designed to answer.
Incidence of New-Onset Sepsis-Associated Acute Lung Injury
New-onset sepsis-associated acute lung injury occurring after enrollment and within 7 days, defined by acute respiratory deterioration, new bilateral pulmonary opacities, hypoxemia, and respiratory failure not fully explained by cardiac failure or fluid overload. Acute lung injury will be adjudicated independently by two physicians blinded to bacterial molecular classification and biomarker results.
Measured: From enrollment (T0) through Day 7
Secondary outcomes (6)
Circulating Gram-Negative Bacterial Outer Membrane Vesicle-Related Signal
Standardized level of lipopolysaccharide-positive extracellular nanoparticles in platelet-depleted plasma, measured using nano-flow cytometry or an equivalent validated assay. The result will be interpreted as a Gram-negative bacterial outer membrane vesicle-related signal.
Measured: At enrollment (T0), 24 hours, and 72 hours after enrollment
Ferroptosis-Related Biomarker Profile
Systemic ferroptosis-related biomarker profile assessed by plasma 4-hydroxynonenal protein adducts, malondialdehyde, glutathione, glutathione disulfide, glutathione/glutathione disulfide ratio, iron-related indices, and peripheral blood mononuclear cell expression of GPX4, SLC7A11, ACSL4, FTH1, and NCOA4.
Measured: At enrollment (T0), 24 hours, and 72 hours after enrollment
Lowest PaO₂/FiO₂ Ratio (or SpO₂/FiO₂ Ratio)
Respiratory dysfunction assessed by the lowest PaO₂/FiO₂ ratio during the observation period. If arterial blood gas analysis is unavailable, the lowest SpO₂/FiO₂ ratio will be used.
Measured: From enrollment through Day 7
Respiratory Sequential Organ Failure Assessment (SOFA) Score
Respiratory dysfunction assessed by the respiratory component of the SOFA score. The Respiratory SOFA sub-score ranges from 0 to 4, on an integer scale, with higher scores indicating worse respiratory function . The score is derived daily from the lowest PaO₂/FiO₂ ratio (or SpO₂/FiO₂ imputation) and the requirement for mechanical ventilation.
Measured: From enrollment through Day 7
Ventilator-Free Days
Number of days alive and free from invasive mechanical ventilation during the first 28 days after enrollment. Participants who die before Day 28 will be assigned zero ventilator-free days.
Measured: From enrollment through Day 28
All-Cause Mortality
Death from any cause after enrollment.
Measured: From enrollment through Day 28
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted7 Jul 2026
- Study start6 Jul 2026 (estimated)
- Primary completion15 Jul 2030 (estimated)
- Study completion30 Jul 2030 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (4)Papers the sponsor has linked to this study.
- Other trials for SepsisStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Cohort
- Time perspective
- Prospective
- Enrolment
- 120 participants (estimated)
- Target duration
- 28 Days
Sponsor and investigators
- Lead sponsor
- Southeast University, China
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Jingyuan,Xu, Southeast University, China
- Investigators
- Jingyuan Xu, MD, Study chair, Southeast University School of Medicine
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07686887
- Sponsor's protocol ID
- 2025ZDSYLL431-P01
- Other IDs
- 82572527, BK20252100, QNRC2016808, zdyyxy29
- Acronym
- OMV-FERRO-ALI
- Status last verified
- Jul 2026
- First submitted
- 30 Jun 2026
- Last updated
- 13 Jul 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- Undecided: The decision regarding sharing of de-identified individual participant data has not yet been finalized. The research team will evaluate data-sharing feasibility after study completion, taking into account participant privacy, informed consent, institutional ethics requirements, data protection regulations, and the sensitivity of clinical and microbiological data.
Publications
Russo TA, Olson R, Fang CT, Stoesser N, Miller M, MacDonald U, Hutson A, Barker JH, La Hoz RM, Johnson JR. Identification of Biomarkers for Differentiation of Hypervirulent Klebsiella pneumoniae from Classical K. pneumoniae. J Clin Microbiol. 2018 Aug 27;56(9):e00776-18. doi: 10.1128/JCM.00776-18. Print 2018 Sep.
PubMed 29925642Liu P, Feng Y, Li H, Chen X, Wang G, Xu S, Li Y, Zhao L. Ferrostatin-1 alleviates lipopolysaccharide-induced acute lung injury via inhibiting ferroptosis. Cell Mol Biol Lett. 2020 Feb 27;25:10. doi: 10.1186/s11658-020-00205-0. eCollection 2020.
PubMed 32161620Lee JC, Lee EJ, Lee JH, Jun SH, Choi CW, Kim SI, Kang SS, Hyun S. Klebsiella pneumoniae secretes outer membrane vesicles that induce the innate immune response. FEMS Microbiol Lett. 2012 Jun;331(1):17-24. doi: 10.1111/j.1574-6968.2012.02549.x. Epub 2012 Apr 13.
PubMed 22428779Zhang J, Zhao J, Li J, Xia Y, Cao J. Outer membrane vesicles derived from hypervirulent Klebsiella pneumoniae stimulate the inflammatory response. Microb Pathog. 2021 May;154:104841. doi: 10.1016/j.micpath.2021.104841. Epub 2021 Mar 7.
PubMed 33691173
Study at a glance
From the registry record, last updated by the sponsor on 13 Jul 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Circulating Bacterial Outer Membrane Vesicle Signatures and Ferroptosis-Related Biomarkers in Sepsis-Associated Acute Lung Injury Among Patients With Extra-Pulmonary Hypervirulent Klebsiella Pneumoniae Infection: A Prospective Observational Translational Cohort Study
- ClinicalTrials.gov ID
- NCT07686887
- Acronym / sponsor ID
- OMV-FERRO-ALI / 2025ZDSYLL431-P01
- Conditions
- Sepsis, Acute Lung Injury(ALI), Klebsiella Pneumoniae Infection, Hypervirulent Klebsiella Pneumoniae Infection
- Keywords
- Hypervirulent Klebsiella pneumoniae, Extra-pulmonary infection, Sepsis-associated acute lung injury, Bacterial outer membrane vesicles, Ferroptosis, Pulmonary microvascular endothelial cells, Lipid peroxidation, Endothelial barrier dysfunction
- Study type
- Observational
- Recruitment status
- Not yet recruiting
- Enrolment
- 120 participants (estimated)
- Lead sponsor
- Southeast University, ChinaUniversity, hospital or other
- Study start
- 6 Jul 2026 (estimated)
- Primary completion
- 15 Jul 2030 (estimated)
- Study completion
- 30 Jul 2030 (estimated)
- First posted
- 7 Jul 2026 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
This prospective observational translational cohort study will investigate whether extra-pulmonary infection caused by hypervirulent Klebsiella pneumoniae (hvKP) is associated with an increased risk of sepsis-associated acute lung injury (SALI), compared with infection caused by classical Klebsiella pneumoniae (cKP). The study will further examine whether circulating bacterial outer membrane vesicle (OMV) signals and ferroptosis-related biomarker profiles are associated with subsequent SALI development.
Adults with Sepsis-3 and microbiologically confirmed extra-pulmonary K. pneumoniae infection will be enrolled within 6 hours of sepsis recognition. Patients with acute lung injury at enrollment will be excluded from the primary cohort. Blood samples will be collected at enrollment, 24 hours, and 72 hours. Clinical isolates will undergo molecular characterization to classify infections as hvKP or cKP. The primary outcome will be new-onset SALI within 7 days after enrollment. A nested translational substudy will evaluate the effects of patient-isolate-derived OMVs on human pulmonary microvascular endothelial cells.
The study will not alter antimicrobial therapy, source control, respiratory support, fluid management, or any other aspect of routine clinical care.
Detailed description
Sepsis-associated acute lung injury is a major complication of severe extra-pulmonary Gram-negative bacterial infection. Hypervirulent Klebsiella pneumoniae (hvKP) is increasingly recognized as a cause of invasive infection with a high inflammatory burden and a propensity for metastatic spread. Bacterial outer membrane vesicles (OMVs) are biologically active nanoparticles that may transport lipopolysaccharide, virulence-associated molecules, and other inflammatory cargo to distant organs. Experimental evidence suggests that OMV-mediated oxidative stress and ferroptosis-related injury may contribute to pulmonary endothelial dysfunction and acute lung injury; however, the clinical relevance of these mechanisms in patients with extra-pulmonary hvKP sepsis remains unclear.
This prospective multicenter observational translational cohort study will investigate the relationship among molecularly characterized hvKP infection, circulating bacterial OMV-related signals, ferroptosis-related biomarker profiles, and the subsequent development of sepsis-associated acute lung injury. Adults with microbiologically confirmed extra-pulmonary Klebsiella pneumoniae sepsis will be enrolled early after sepsis recognition and followed during the acute phase of illness. Clinical isolates will undergo molecular characterization for prespecified hypervirulence-associated genes and additional strain-level features. Blood specimens collected during routine early follow-up will be processed using standardized procedures for plasma, serum, and peripheral blood mononuclear cell analyses.
The laboratory component will quantify circulating Gram-negative bacterial OMV-related signals in platelet-depleted plasma and evaluate systemic ferroptosis-related biomarker profiles, including lipid peroxidation products, glutathione redox status, iron-related indices, and ferroptosis-associated gene expression. Patient-derived Klebsiella pneumoniae isolates will also be cultured under standardized conditions for OMV isolation and characterization.
A nested translational substudy will compare OMVs derived from representative hvKP and classical Klebsiella pneumoniae isolates. Equal-particle-number OMV preparations will be applied to human pulmonary microvascular endothelial cells to assess lipid peroxidation, ferroptosis-related molecular changes, endothelial barrier integrity, and the in vitro rescue effect of Ferrostatin-1. No investigational intervention will be administered to study participants, and all clinical management will remain at the discretion of the treating physicians.
Study design
- Observational model
- Cohort
- Time perspective
- Prospective
- Target follow-up
- 28 Days
- Number of arms
- 3
| Arm | Type | Receives |
|---|---|---|
| Cohort 1 Title: Hypervirulent Klebsiella pneumoniae Infection | – | –Cohort 1 Description: Participants with subsequently confirmed extra-pulmonary Klebsiella pneumoniae infection whose clinical isolate carries iucA, iroB, peg-344, rmpA, and rmpA2. |
| Cohort 2 Title: Classical Klebsiella pneumoniae Infection | – | –Cohort 2 Description: Participants with subsequently confirmed extra-pulmonary Klebsiella pneumoniae infection whose clinical isolate lacks all five prespecified hypervirulence-associated genes: iucA, iroB, peg-344, rmpA, and rmpA2. |
| Cohort 3 Title: Indeterminate Klebsiella pneumoniae Molecular Phenotype | – | –Cohort 3 Description: Participants with subsequently confirmed extra-pulmonary Klebsiella pneumoniae infection whose clinical isolate carries one to four of the five prespecified hypervirulence-associated genes. This cohort will be included in exploratory analyses only. |
Who may qualify
- Ages
- 18 to 85 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
- Study population
- Consecutively enrolled adults with clinically suspected sepsis caused by a presumed extra-pulmonary infection will be recruited from emergency departments, hospital wards, and intensive care units. Baseline blood samples will be collected during early sepsis evaluation, before culture results or bacterial molecular typing are available. The primary analytic cohort will include participants who subsequently meet Sepsis-3 criteria, have microbiologically confirmed extra-pulmonary Klebsiella pneumoniae infection, have no acute lung injury at enrollment, and have an available clinical isolate for molecular characterization. Isolates will be classified as hypervirulent Klebsiella pneumoniae, classical Klebsiella pneumoniae, or indeterminate phenotype according to prespecified virulence-gene criteria. Patients with primary pulmonary infection, non-Klebsiella pneumoniae infection, mixed infection, culture-negative sepsis, or non-infectious diagnoses will not enter the primary analysis.
Key inclusion criteria (7 listed)
- Age 18-85 years .
- Clinical suspicion of infection with acute organ dysfunction consistent with suspected sepsis at the time of enrollment, as determined by the treating clinical team.
- Presumed extra-pulmonary source of infection at enrollment, including but not limited to hepatobiliary, urinary, intra-abdominal, skin and soft-tissue, vascular catheter-related, or primary bloodstream infection.
- Blood cultures and/or clinically indicated source cultures obtained or ordered as part of routine clinical care.
- Enrollment and first research blood collection completed within 6 hours after initiation of the clinical sepsis evaluation.
Key exclusion criteria (6 listed)
- Suspected or confirmed primary pulmonary infection at enrollment, including community-acquired pneumonia, hospital-acquired pneumonia, ventilator-associated pneumonia, or aspiration pneumonia.
- Acute lung injury or acute respiratory distress syndrome present at the index time point.
- Acute cardiogenic pulmonary edema, acute decompensated heart failure, or another condition that would preclude reliable adjudication of subsequent non-cardiogenic acute lung injury.
- Recent inhalation injury, near-drowning, major thoracic trauma, or transfusion-related acute lung injury.
- Previous enrollment in this study.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Primary outcome
Incidence of New-Onset Sepsis-Associated Acute Lung Injury
Time frame: From enrollment (T0) through Day 7
New-onset sepsis-associated acute lung injury occurring after enrollment and within 7 days, defined by acute respiratory deterioration, new bilateral pulmonary opacities, hypoxemia, and respiratory failure not fully explained by cardiac failure or fluid overload. Acute lung injury will be adjudicated independently by two physicians blinded to bacterial molecular classification and biomarker results.
6 secondary outcomes
Circulating Gram-Negative Bacterial Outer Membrane Vesicle-Related Signal
Time frame: At enrollment (T0), 24 hours, and 72 hours after enrollment
Ferroptosis-Related Biomarker Profile
Time frame: At enrollment (T0), 24 hours, and 72 hours after enrollment
Lowest PaO₂/FiO₂ Ratio (or SpO₂/FiO₂ Ratio)
Time frame: From enrollment through Day 7
Respiratory Sequential Organ Failure Assessment (SOFA) Score
Time frame: From enrollment through Day 7
Ventilator-Free Days
Time frame: From enrollment through Day 28
All-Cause Mortality
Time frame: From enrollment through Day 28
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 13 Jul 2026.
- Results publication: PubMed 29925642Russo TA, Olson R, Fang CT, Stoesser N, Miller M, MacDonald U, Hutson A, Barker JH, La Hoz RM, Johnson JR. Identification of Biomarkers for Differentiation of Hypervirulent Klebsiella pneumoniae from Classical K. pneumoniae. J Clin Microbiol. 2018 Aug 27;56(9):e00776-18. doi: 10.1128/JCM.00776-18. Print 2018 Sep.
- Results publication: PubMed 32161620Liu P, Feng Y, Li H, Chen X, Wang G, Xu S, Li Y, Zhao L. Ferrostatin-1 alleviates lipopolysaccharide-induced acute lung injury via inhibiting ferroptosis. Cell Mol Biol Lett. 2020 Feb 27;25:10. doi: 10.1186/s11658-020-00205-0. eCollection 2020.
- Results publication: PubMed 22428779Lee JC, Lee EJ, Lee JH, Jun SH, Choi CW, Kim SI, Kang SS, Hyun S. Klebsiella pneumoniae secretes outer membrane vesicles that induce the innate immune response. FEMS Microbiol Lett. 2012 Jun;331(1):17-24. doi: 10.1111/j.1574-6968.2012.02549.x. Epub 2012 Apr 13.
- Results publication: PubMed 33691173Zhang J, Zhao J, Li J, Xia Y, Cao J. Outer membrane vesicles derived from hypervirulent Klebsiella pneumoniae stimulate the inflammatory response. Microb Pathog. 2021 May;154:104841. doi: 10.1016/j.micpath.2021.104841. Epub 2021 Mar 7.
- Individual participant dataSharing planned: Undecided. The decision regarding sharing of de-identified individual participant data has not yet been finalized. The research team will evaluate data-sharing feasibility after study completion, taking into account participant privacy, informed consent, institutional ethics requirements, data protection regulations, and the sensitivity of clinical and microbiological data.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part.
Jingyuan Xu, MD study chair
Southeast University School of Medicine
Questions about this trial
What is this clinical trial studying?
An observational study of Sepsis and Acute Lung Injury(ALI), run by Southeast University, China.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 7 inclusion and 6 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: opening soon, as of the sponsor's last update on 13 Jul 2026. Status can change between updates, so confirm with the study contact before making plans.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact Jingyuan Xu, MD (+8613851417209, xujingyuanmail@163.com), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Incidence of New-Onset Sepsis-Associated Acute Lung Injury (time frame: From enrollment (T0) through Day 7). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT07686887, which also lists 4 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 13 Jul 2026.