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Helicobacter pylori Infection – Causes and Treatment

Helicobacter pylori infection is a bacterial infection of the stomach lining that can cause gastritis, peptic ulcers, and in rare cases stomach cancer. It is one of the most common infections worldwide and is highly treatable.

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Things worth knowing about "Helicobacter pylori Infection"

Helicobacter pylori infection is a bacterial infection of the stomach lining that can cause gastritis, peptic ulcers, and in rare cases stomach cancer. It is one of the most common infections worldwide and is highly treatable.

What Is a Helicobacter pylori Infection?

A Helicobacter pylori infection occurs when the bacterium Helicobacter pylori (H. pylori) colonizes the lining of the stomach or the duodenum (the first part of the small intestine). This spiral-shaped bacterium is uniquely adapted to survive in the acidic environment of the stomach and can cause persistent inflammation of the stomach lining (gastritis). H. pylori is one of the most prevalent bacterial infections globally, affecting an estimated 50% of the world population, with significantly higher rates in developing countries.

Causes and Transmission

The exact routes of H. pylori transmission are not entirely understood, but the most commonly identified pathways include:

Fecal-oral route: Ingestion of the bacterium through contaminated water or food
Oral-oral route: Transmission through close contact with an infected person, such as through saliva
Poor sanitation and hygiene: Limited access to clean drinking water and proper sanitation significantly increases the risk of infection

Infection most often occurs during childhood and may remain undetected for many years or even decades.

Symptoms

Many people infected with H. pylori experience no symptoms at all. When symptoms do occur, they may include:

Upper abdominal pain or a burning sensation in the stomach
Nausea and occasional vomiting
Belching and bloating
Loss of appetite
Unintentional weight loss
Dark or tarry stools, which may indicate a gastrointestinal bleed

In more serious cases, H. pylori infection can lead to the development of peptic ulcers (stomach or duodenal ulcers). Long-term infection is also associated with an increased risk of stomach cancer (gastric adenocarcinoma) and certain types of stomach lymphoma (MALT lymphoma).

Diagnosis

Several diagnostic methods are available to detect H. pylori infection:

Non-Invasive Tests

Urea breath test (13C-urea breath test): The patient drinks a solution containing labeled urea. If H. pylori is present, it breaks down the urea and releases labeled CO₂, which is then detected in the exhaled breath.
Stool antigen test: Detects H. pylori antigens directly in a stool sample
Blood antibody test (serology): Detects antibodies against H. pylori, though this method is less reliable for confirming successful eradication

Invasive Tests

Endoscopy (gastroscopy) with biopsy: A small tissue sample is taken from the stomach lining and examined for the presence of H. pylori
Rapid urease test: Detects the enzyme urease produced by H. pylori directly in the biopsy sample

Treatment

The standard treatment for H. pylori infection is called eradication therapy, which aims to permanently eliminate the bacterium from the stomach using a combination of antibiotics and acid-suppressing medications.

Standard Triple Therapy

The most commonly used regimen combines:

A proton pump inhibitor (e.g., omeprazole) to reduce stomach acid production
Two antibiotics (e.g., clarithromycin and amoxicillin, or metronidazole) to kill the bacterium

Treatment typically lasts 7 to 14 days. In cases of treatment failure or antibiotic resistance, alternative regimens such as quadruple therapy may be used.

Confirming Eradication

After completing treatment, a follow-up test (such as a urea breath test or stool antigen test) should be performed to confirm successful eradication. This should be done no sooner than 4 weeks after completing therapy.

Prevention

As no approved vaccine against H. pylori currently exists, the most effective preventive measures focus on general hygiene practices:

Regular handwashing with soap and water
Drinking clean, treated water
Safe food handling and preparation

References

World Health Organization (WHO) – Helicobacter pylori. Available at: https://www.who.int
Malfertheiner P, Megraud F, Rokkas T et al. – European Helicobacter and Microbiota Study Group: Management of Helicobacter pylori infection – the Maastricht VI/Florence Consensus Report. Gut. 2022.
Suerbaum S, Michetti P – Helicobacter pylori Infection. New England Journal of Medicine. 2002;347(15):1175-1186.

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