Characteristics of Helicobacter pylori antibiotic resistance: data from four different populations

Area of Science:

• Medical Microbiology
• Infectious Diseases
• Antimicrobial Resistance

Background:

• Helicobacter pylori (H. pylori) infection is a major cause of gastroduodenal diseases worldwide.
• Antibiotic resistance in H. pylori poses a significant challenge to successful eradication therapy.
• Understanding resistance patterns is crucial for guiding empirical treatment strategies.

Purpose of the Study:

• To characterize the antibiotic resistance profiles of H. pylori clinical isolates from diverse patient populations.
• To compare resistance rates among treatment-naïve adults, previously treated adults, treatment-naïve children, and a general adult population.
• To identify demographic factors influencing H. pylori antibiotic resistance.

Main Methods:

• Analysis of 1463 H. pylori strains isolated from four distinct populations.
• Determination of minimum inhibitory concentrations (MICs) using the E-test method for key antibiotics.
• Categorization of isolates based on treatment history and age.

Main Results:

• High resistance rates were observed for metronidazole (78.4%) and clarithromycin (19.0%) in treatment-naïve adults.
• Previously treated adults exhibited significantly higher resistance rates for metronidazole (99.2%), clarithromycin (58.3%), and levofloxacin (52.3%).
• Treatment-naïve children showed lower metronidazole resistance (46.0%), and clarithromycin resistance was low in younger patients (10-24 years) and the general population.

Conclusions:

• Metronidazole, clarithromycin, and levofloxacin resistance is notably high, especially in previously treated adult patients.
• Clarithromycin resistance is significantly lower in younger treatment-naïve patients and the general population compared to older treatment-naïve adults.
• These findings underscore the need for tailored H. pylori treatment guidelines based on local resistance patterns and patient history.