Can Helicobacter pylori Infection Spread from Person to Person?

Helicobacter pylori infection is indeed contagious, though transmission routes are not fully understood. Current evidence suggests that person-to-person spread—particularly within families—is the most likely mode of transmission. The bacterium is thought to pass via the oral-oral route (e.g., through saliva during close contact such as sharing utensils or pre-chewing food for infants) or the fecal-oral route (e.g., via contaminated water or poor hand hygiene after using the restroom).

While H. pylori is widespread globally—with prevalence exceeding 50% in many low- and middle-income countries—it rarely spreads in casual, non-household settings like schools or workplaces. Infection typically occurs in childhood and persists for life unless treated with appropriate antibiotic therapy. Importantly, not everyone infected develops symptoms or complications; however, chronic colonization increases the risk of peptic ulcer disease, gastric mucosa-associated lymphoid tissue (MALT) lymphoma, and gastric adenocarcinoma.

Diagnosis relies on non-invasive tests—including urea breath testing, stool antigen assays, and serology—or invasive methods such as upper endoscopy with biopsy and histopathologic examination. Treatment follows internationally endorsed regimens, usually involving a proton pump inhibitor combined with two or more antibiotics for 10–14 days, with eradication success rates varying by regional antibiotic resistance patterns.

Preventive measures focus on improved sanitation, access to clean drinking water, and consistent handwashing—especially before eating and after toileting. Routine screening or prophylactic treatment is not recommended for asymptomatic individuals in low-risk populations, but clinicians should consider testing in patients with dyspepsia, unexplained iron-deficiency anemia, or a personal or family history of gastric cancer.