Related Experiment Video
Updated: May 1, 2026
04:56
Detection of Helicobacter pylori Infection and Antibiotic Resistance via Stool Quantitative Polymerase Chain Reaction Analysis
Published on: May 16, 2025
1.5K
Evaluating the potential for a Helicobacter pylori drinking water guideline
Michael Ryan1, Kerry Hamilton, Michael Hamilton
1Department of Civil Architectural and Environmental Engineering, Drexel University, Philadelphia, PA, USA.
Summary
Quantitative microbial risk assessment (QMRA) for Helicobacter pylori in drinking water suggests a maximum contaminant level (MCL) below 1 organism/L to protect public health from ulcers and cancer risks.
Area of Science:
- Environmental microbiology
- Public health risk assessment
- Water quality management
Background:
- Helicobacter pylori (H. pylori) is a bacterium linked to ulcers and gastrointestinal cancers.
- Drinking water contamination with H. pylori poses a public health risk.
- Current surface water concentrations may exceed acceptable risk levels.
Purpose of the Study:
- To develop inputs for a quantitative microbial risk assessment (QMRA) for H. pylori in drinking water.
- To establish a potential maximum contaminant level (MCL) protective of human health.
- To assess risks from current H. pylori levels and determine acceptable concentrations.
Main Methods:
- Utilized infection and gastric cancer as discrete endpoints for risk assessment.
- Calculated dose-response relationships from human and monkey experimental data.
- Performed forward and reverse risk assessments based on reported surface water concentrations.
Main Results:
- A lifetime cancer risk model suggests an MCL of <1 organism/L with a 5-log treatment removal.
- Current H. pylori levels in environmental source waters may pose a public health risk.
- Significant uncertainties and research gaps remain regarding H. pylori occurrence and risk.
Conclusions:
- A stringent MCL is recommended to mitigate H. pylori-associated health risks in drinking water.
- Further research is needed on pathogen occurrence, treatment efficacy, and risks from diverse water sources.
- Protecting public health requires addressing H. pylori contamination in drinking water supplies.
Related Concept Videos
01:16Treating Helicobacter pylori in Peptic Ulcers: Antimicrobial Therapy
2.5K
Helicobacter pylori, a resilient gram-negative bacterium, can thrive in the stomach's harsh, acidic environment. Infection with H. pylori leads to a cascade of events within the stomach lining. One of the critical disruptions caused by this bacterium is the interference with somatostatin production, a hormone responsible for regulating acid secretion. This interference tips the balance, escalating acid secretion and diminishing bicarbonate levels. This imbalance compromises the defensive...
2.5K
01:28Peptic Ulcer Disease III: Clinical Manifestations and Diagnostic Studies
1.0K
Peptic ulcer disease (PUD) presents with diverse symptoms depending on the location and severity of the ulcer. Clinical manifestations of peptic ulcer include dull pain and a burning sensation in the mid-epigastric region.
Few clinical manifestations differentiate gastric ulcers from duodenal ulcers. Distinctions in the location, timing, and pain relief are crucial for healthcare providers in differentiating between gastric and duodenal ulcers during clinical assessments.
Few clinical manifestations differentiate gastric ulcers from duodenal ulcers. Distinctions in the location, timing, and pain relief are crucial for healthcare providers in differentiating between gastric and duodenal ulcers during clinical assessments.
1.0K
01:27Peptic Ulcer
48
Peptic ulcers are erosive lesions of the gastric or duodenal lining, most commonly caused by Helicobacter pylori infection. This Gram-negative, helical bacterium has adapted to survive the stomach’s acidic environment by producing urease, which converts urea into ammonia and carbon dioxide. The ammonia neutralizes gastric acid in the bacterium’s immediate environment, allowing colonization of the gastric mucosa. H. pylori attaches to mucus-secreting epithelial cells, penetrates the...
48
01:26Gastritis II: Pathophysiology
52
The pathophysiology of gastritis begins with the colonization of the stomach lining by Helicobacter pylori (H. pylori). This bacterium spreads mainly via the oral-oral route through saliva or shared utensils, and can also be transmitted in overcrowded or unhygienic environments through contaminated water, despite its brief survival outside the body.ColonizationOnce ingested, H. pylori enters the stomach and begins colonization by navigating through the mucus layer lining the stomach wall. It...
52