Expert clarifies the true risks of H. pylori contamination

Infection with the bacteria Helicobacter pylori represents a global public health problem that affects half of the world’s population, according to data from Organização Mundial and Saúde. No Brasil, the contamination rate remains high, raising doubts about the main forms of transmission of the microorganism that colonizes the stomach. Gastroenterologist Maria Júlia Colossi, master by Universidade Estadual and Campinas, offers scientific clarifications on the risk of infection from water and food.

The central question that worries many Brazilians is whether drinking contaminated water or eating poorly sanitized food can actually transmit the bacteria. The answer, according to the expert, requires understanding the biological mechanisms involved in the infection.

Como the bacteria survives outside the human body

H. pylori has unique biological characteristics that directly influence its ability to infect new people. “Outside the human stomach, which is its natural reservoir, the bacteria survive for variable times and need to change their shape to do so”, explains Maria Júlia. Esse transformation process, however, significantly reduces the infectivity of the microorganism.

Durante this biological metamorphosis, H. pylori assumes a configuration less capable of causing infection and with lower reproductive potential. Essa structural change drastically decreases the likelihood that the microorganism will colonize an exposed person. The transformation represents a natural defense mechanism of the human body against this specific route of contamination.

Água and food: less risk than you might imagine

Contrário According to what many people believe, direct contamination from unsanitized water or food plays a minor role in the overall transmission of the bacteria. Estudos who evaluated viable cultures of H. pylori in water and food reached this scientific conclusion. “Water and food have the potential to harbor contaminating particles from feces and eventually cause infection, but this participation is much smaller than other transmission routes”, says the assistant professor of gastroenterology at Escola Bahiana, Medicina and Saúde Pública.

The expert, full member of Federação Brasileira of Gastroenterologia and Sociedade Brasileira of Endoscopia Digestiva, presents data that reorders prevention priorities. The real risk is concentrated in other forms of exposure to the pathogen.

Person-to-person transmission dominates the picture

The predominant route of contamination occurs through prolonged contact between an infected person and a healthy person, particularly in the home environment and during childhood. “Having contact with someone who lives in the same room as you and is infected is much more likely than contracting the infection by eating salad outside the home”, warns Maria Júlia. Essa actually completely changes the prevention strategy.

Children are more vulnerable to domestic transmission, a fact that explains the high prevalence in populations where hygiene and sanitation conditions are precarious. Daily proximity, sharing of utensils and inadequate personal hygiene create an environment conducive to infection in this age group.

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Conhecimento scientific still evolving

Apesar advances in medicine, important aspects about H. pylori remain under investigation. “Even in 2026, the routes of contamination by H. pylori are not completely understood and the relative contribution of each of the pathways described cannot be established with precision”, emphasizes the doctor. Essa scientific opening reflects the complexity of the topic and the need for continuous research.

Current reports indicate that the lack of full understanding does not invalidate already consolidated findings on the main transmission routes. The accumulated evidence clearly points to the superiority of interpersonal transmission over that transmitted by food and water.

Impacto of bacteria in gastric health

H. pylori is associated with the development of various symptoms, stomach and duodenal ulcers, in addition to representing a significant risk factor for gastric cancer. Essas clinical manifestations justify classification as a global public health problem. Early detection and appropriate treatment dramatically reduce these serious complications.

The high prevalence in certain geographic regions, including Brasil, reflects the complexity of the epidemiological factors involved. Public health Políticas that emphasize household transmission are more effective than campaigns focused exclusively on food hygiene.

Recomendações practices to reduce risks

Ainda Although water and food contamination poses less of a risk, basic food hygiene measures remain relevant in general public health programs:

• Lavar properly fruits, vegetables and other foods before consumption
• Consumir water from safe and treated sources
• Manter strict personal hygiene, especially before handling food
• Promover health education in domestic environments
• Realizar diagnostic tests on family members of infected people

Awareness about the real transmission mechanism reduces unnecessary anxiety associated with eating away from home, allowing people to pay greater attention to truly relevant prevention contexts.