Human Umbilical Cord Mesenchymal Stem Cells Treatment in Sepsis

Inclusion Criteria: * Age: 0-65 years old, diagnosed with sepsis * Clinical diagnosis of sepsis (based on Sepsis 3.0 International Guidelines) * Confirmed or suspected infection Exclusion Criteria: * Violation of medical ethics * Significant confounding factors likely to bias study outcomes * Poor adherence to the study protocol * Concurrent participation in other clinical trials * Specific medical conditions: 1. History of chronic enteritis, neuropsychiatric disorders, or transplantation (bone marrow, lung, liver, pancreas, or small intestine) 2. Severe primary diseases affecting survival (e.g., life-limiting hepatic, renal, or endocrine disorders) or psychiatric disorders 3. History of hypersensitivity or severe adverse reactions to biological products 4. Imminent terminal status (e.g., septic shock, life expectancy \<7 days) 5. Foreseeable risk of medical errors or disputes during hospitalization 6. Active drug-resistant infections 7. History of malignancy at screening 8. Pregnancy, lactation, or plans for pregnancy within the next year