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Related Concept Videos

Treating Helicobacter pylori in Peptic Ulcers: Antimicrobial Therapy01:16

Treating Helicobacter pylori in Peptic Ulcers: Antimicrobial Therapy

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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...
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Pathophysiology of Peptic Ulcer Disease: Injurious Factors01:22

Pathophysiology of Peptic Ulcer Disease: Injurious Factors

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Peptic ulcers are sores on the stomach's inner lining and the upper small intestine, which are the result of disruptions in the mucosal layer that houses parietal cells which produce gastric acid, and chief cells which secrete pepsinogen.
In the antrum region, G cells secrete the gastrin hormone that binds to gastrin-cholecystokinin-B (CCK2) receptors on parietal and enterochromaffin-like (ECL) cells in the fundic glands. Simultaneously, the vagus nerve releases acetylcholine, which binds...
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Peptic Ulcer Disease III: Clinical Manifestations and Diagnostic Studies01:28

Peptic Ulcer Disease III: Clinical Manifestations and Diagnostic Studies

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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.
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Peptic Ulcer Disease I: Introduction01:30

Peptic Ulcer Disease I: Introduction

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Peptic Ulcer Disease (PUD) is characterized by mucosal excavation in the esophagus, stomach, pylorus, or duodenum. It can manifest as acute or chronic based on the extent and duration of mucosal involvement.
An acute ulcer, marked by superficial erosion and minimal inflammation, swiftly resolves upon identifying and addressing the underlying cause. In contrast, a chronic ulcer persists, potentially eroding through the muscular wall and forming fibrous tissue.
Peptic ulcers can also be...
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Gastritis-II: Pathophysiology01:17

Gastritis-II: Pathophysiology

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Gastritis is marked by disruption of the mucosal barrier that usually protects the stomach tissue from digestive juices and manifests in acute and chronic forms.
In acute gastritis, the gastric mucosa becomes swollen and red and undergoes superficial erosion. Superficial ulceration may lead to bleeding.
In chronic gastritis, persistent or repeated insults lead to chronic inflammatory changes and, eventually, thinning or atrophy of the gastric tissue.
Gastritis can stem from various causes, each...
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Mucosal Barrier of the Stomach01:25

Mucosal Barrier of the Stomach

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The gastric glands contain parietal cells that secrete hydrochloric acid (HCl) for digestion. The cells secrete HCl because it is highly corrosive and essential for breaking down food. To achieve this, they secrete hydrogen and chloride ions into the lumen of the gastric glands, which combine to form HCl.
Within parietal cells, carbonic acid is first formed through the reaction of water and carbon dioxide. The dissociation of carbonic acid releases bicarbonate and hydrogen ions. The bicarbonate...
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Updated: Oct 30, 2025

Gastric Mucosa Quantitative Polymerase Chain Reaction Analysis for Detecting Helicobacter pylori and Antibiotic Resistance
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Gastric Mucosa Quantitative Polymerase Chain Reaction Analysis for Detecting Helicobacter pylori and Antibiotic Resistance

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Helicobacter pylori.

David Y Graham1

  • 1Department of Medicine, Michael E. DeBakey Veterans Affairs Medical Center and Baylor College of Medicine, RM 3A-390A (111D), 2002 Holcombe Boulevard, Houston, TX, 77030, USA. dgraham@bcm.edu.

Current Topics in Microbiology and Immunology
|July 5, 2021
PubMed
Summary
This summary is machine-generated.

Developing a Helicobacter pylori vaccine is a cost-effective strategy due to rising antimicrobial resistance. This study details challenge protocols and recommends histologic assessment of gastric biopsies for accurate infection monitoring.

Keywords:
GuidelinesHelicobacter pyloriHuman challengeOral vaccinationParenteral vaccinationProtocolsTechniquesVaccine development

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Area of Science:

  • Medical Microbiology
  • Vaccinology
  • Gastroenterology

Background:

  • Helicobacter pylori infection affects half the global population, leading to peptic ulcers and gastric cancer.
  • Antimicrobial resistance is increasing, making H. pylori eradication challenging and costly.
  • Vaccine development offers a cost-effective alternative to combat H. pylori-associated diseases.

Purpose of the Study:

  • To provide detailed protocols for H. pylori challenge studies to assess vaccine effectiveness.
  • To guide the selection of challenge strains and administration methods.
  • To recommend reliable methods for confirming and monitoring experimental H. pylori infections.

Main Methods:

  • Detailed protocols for challenge strain selection and administration in experimental infections.
  • Guidance on clinical and laboratory tests for monitoring infection.
  • Emphasis on histologic assessment of gastric mucosal biopsies for accurate diagnosis.

Main Results:

  • Challenge studies are crucial for "go-no go" decisions on vaccine efficacy.
  • Noninvasive methods may lead to underestimation of infection rates.
  • Histologic assessment of gastric biopsies is proposed as a sensitive and specific diagnostic tool.

Conclusions:

  • Vaccine development is a critical and cost-effective strategy against H. pylori.
  • Standardized challenge study protocols are essential for vaccine evaluation.
  • Histologic examination of gastric biopsies is recommended for accurate assessment of H. pylori infection and eradication.