[Sensitivity Comparison Experiment of Four Testing Methods for Helicobacter pylori]

Area of Science:

• Microbiology
• Diagnostic testing
• Molecular diagnostics

Background:

• Accurate detection of Helicobacter pylori (Hp) is crucial for managing gastrointestinal diseases.
• Standard microbiology methods vary in sensitivity and efficiency for Hp detection.

Purpose of the Study:

• To compare the sensitivity of four common Hp testing methods: bacterial culture, rapid urease test, antigen test, and quantitative fluorescent PCR.
• To analyze the correlations and differences in performance across these diagnostic techniques.

Main Methods:

• Utilized the Hp standard strain (SS1) and colony forming units (CFU) for quantitative analysis.
• Employed gradient dilution of SS1 suspension to simulate various sample concentrations.
• Measured the sensitivity thresholds for bacterial culture, rapid urease test, antigen test, and quantitative fluorescent PCR.

Main Results:

• Sensitivity levels were determined as follows: bacterial culture (2.0×10 CFU/mL), rapid urease test (2.0×10^5 CFU/mL), antigen test (2.0×10^5 CFU/mL), and quantitative fluorescent PCR (2.0×10^2 CFU/mL).
• Significant variations in testing turnover time and sensitivity were observed among the methods.

Conclusions:

• Quantitative fluorescent PCR and bacterial culture demonstrate high sensitivity for Hp detection.
• Bacterial culture is time-consuming and operationally complex.
• Rapid urease and antigen tests are quick but less sensitive.
• Choosing the appropriate Hp testing method depends on the specific diagnostic purpose and required sensitivity.