Identification of Pathogenic Bacteria of Diabetes Foot Ulcer

Based on the principle of 16SrDNA detection, this study developed an efficient and convenient gene chip, which can accurately identify and quantitatively analyze different types of pathogenic bacteria at the molecular level. Through this technology, it can significantly improve the diagnostic efficiency and accuracy of diabetic foot infection, provide patients with more timely treatment, reduce the risk of complications caused by infection, and improve the quality of life of patients.

Objective:

• Development of efficient gene chip: Design a gene chip that can rapidly detect pathogenic bacteria in diabetic foot infection wounds. By detecting the 16SrDNA sequence, the chip can identify a variety of pathogenic bacteria and provide accurate data support for clinical diagnosis
• Evaluate the difference in detection time between gene-chip detection technology and traditional schemes: traditional bacterial culture and identification methods usually take several days, but this study aims to shorten the detection time (i.e. the time from taking wound samples to getting pathogenic bacteria detection results) to several hours through gene-chip technology, so as to improve the diagnostic efficiency and obtain pathogenic bacteria information in time
• Compare the sensitivity and specificity of gene chip and traditional methods (such as bacterial culture) in detecting pathogenic bacteria, and then obtain the changes in the diagnostic accuracy of gene chip technology: The Sensitivity, Specificity, positive predictive value (PPV), negative predictive value (NPV) and other key diagnostic indicators of the pathogen were tested for specificity of diabetic foot infection, and the diagnostic accuracy of specificity was verified by comparing with traditional bacterial specificity Methods:This study is a scientific research project carried out in the laboratory. Through consulting the common bacterial strains cultured by diabetic foot infection in our hospital, the probe is made by adding anaerobic bacterial strains according to the literature. Informed consent was signed, about 60 subjects were recruited according to inclusion and exclusion criteria, and more than three specimens were collected for each subject. One was used to analyze pathogenic bacteria by conventional bacterial culture method; One pathogen was sequenced using conventional 16SrDNA; A gene chip analysis, using quantitative chip technology, to determine the content of each bacteria, with the highest content of bacteria reference as a pathogen. The sequencing result of bacterial content detected by bacterial 16SrDNA chip, the highest content, should be consistent with the conventional bacterial culture results.

Inclusion criteria

• Age ≥ 18 years old
• Gender: males and females
• Patients diagnosed with diabetic foot infection with an infected wound
• It can provide sufficient infected wound samples (≥5mm³ infected wound tissue samples or ≥100μL infected wound secretions) and can be used for detection and analysis of gene chips
• No history of antibiotic therapy prior to sampling (within 4 weeks) or known failure to respond to antibiotic therapy (failure to respond to ≥2 antibiotics)
• Fully understand the nature, significance, possible benefits, possible inconveniences or potential risks of this research; Understand the study procedure, participate voluntarily and be willing to complete the entire study process, and sign the informed consent

Exclusion criteria

• Patients with undiagnosed diabetic foot infection
• Patients who had received antibiotics within 4 weeks prior to sampling
• Complicated with serious systemic disease (e.g., malignant tumor, severe cardiopulmonary insufficiency, etc.)
• Pregnant or lactating women
• Cognitive impairment or inability to cooperate with the research process
• History of allergies or allergies to materials related to the study