# Helicobacter pylori Seroprevalence and Its Associations with Sociodemographic Characteristics, Environmental Factors, and Gastrointestinal Complaints: A Cross-Sectional Study in the Adult Population of Kaunas City, Lithuania

## TL;DR

This study found that over 60% of adults in Kaunas, Lithuania, have been exposed to Helicobacter pylori, a cancer-causing bacteria, with higher rates in older men and those with lower education.

## Contribution

The study provides updated, large-scale data on H. pylori seroprevalence in Lithuania and identifies sociodemographic and environmental risk factors.

## Key findings

- The overall H. pylori seroprevalence was 63.1% in Lithuanian adults.
- Seropositivity was highest in males aged 55–69 at 80.3%.
- Lower education and childhood lack of access to municipal or heated water were linked to higher infection rates.

## Abstract

Background and Objectives: Helicobacter pylori, classified as a Group I carcinogen, is the main risk factor for gastric cancer, one of the leading causes of cancer mortality globally. Lithuania reports one of the highest gastric cancer rates in Europe, yet recent large-scale epidemiological data on H. pylori prevalence are lacking. This study aimed to assess the current seroprevalence of H. pylori in Lithuanian adults and its associations with sociodemographic, environmental factors, and dyspeptic symptoms. Materials and Methods: A cross-sectional study was conducted between 2020 and 2023 at the Lithuanian University of Health Sciences in Kaunas city. Randomly selected adults aged 25–69 years underwent venous blood sampling for H. pylori IgG antibody testing (Serion ELISA) and completed a questionnaire on demographic–environmental factors and dyspeptic symptoms in the past 30 days. Subjects previously treated for H. pylori were excluded from seroprevalence analysis. Seroprevalence was compared across age groups using χ2 and Z-tests with Bonferroni correction. Multivariable logistic regression identified factors associated with H. pylori seropositivity. The selected level of statistical significance was p < 0.05. Results: A total of 1046 adults (mean age 47.2 years, SD = 11.5; 50% males) participated in the study. The overall age-standardized H. pylori seroprevalence was 63.1% (95% CI 60.4–66.7). Seropositivity increased with age, peaking at 80.3% in males aged 55–69. Higher seroprevalence was observed among those with basic education and those lacking access to municipal or heated water during childhood. Regression analysis revealed that male sex, aging, and lower education were significantly associated with H. pylori seropositivity. No significant link was found between H. pylori seroprevalence and gastrointestinal complaints. Conclusions: H. pylori seroprevalence remains high in Lithuanian adults, highlighting the need for ongoing surveillance and consideration of screening strategies. H. pylori infection was linked to sociodemographic and environmental factors but not dyspeptic complaints.