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Can I transmit H. pylori to my family?

H. pylori, also known as Helicobacter pylori, is a bacteria that infects the stomach. It is estimated to infect around 50% of the global population. H. pylori infection is associated with various gastrointestinal issues including peptic ulcers and stomach cancer. One common question regarding H. pylori is whether it can be transmitted among family members. This article will provide an overview of H. pylori transmission and the risk of infecting family members.

What is H. pylori?

H. pylori are spiral shaped bacteria that infect the inner lining of the stomach. They have evolved to survive in the harsh, acidic environment of the stomach. Some key facts about H. pylori:

  • Cause chronic gastritis (inflammation of the stomach lining)
  • Associated with peptic ulcers and stomach cancer
  • Classified as a class 1 carcinogen by the World Health Organization
  • Estimated 50% of the global population infected, higher rates in developing countries
  • Often acquired in childhood and can persist for life if left untreated

Despite being so common, only around 20% of those infected develop symptoms. Treatment involves a combination of antibiotics and proton pump inhibitors. Eradication can be challenging and re-infection is possible.

How is H. pylori Transmitted?

H. pylori is considered to spread via a fecal-oral or oral-oral route. This means through contact with stool contaminated food/water or saliva/vomit of infected individuals. Based on epidemiological evidence, here are the likely transmission routes:

  • Fecal-oral – Ingesting food or water contaminated with H. pylori infected feces
  • Oral-oral – Direct contact with vomit or saliva from infected individuals
  • Gastro-oral – Reingesting vomit containing H. pylori (vomiting can coat the bacteria back into the oral cavity)
  • Oro-gastric – Swallowing infected oral secretions into the stomach

Early childhood appears to be the highest risk period for acquiring infection. Transmission likely occurs between family members and others in close contact during daily living. In developing countries with poor sanitation, food and waterborne spread is more common.

Can H. pylori Spread Between Family Members?

Yes, intrafamilial spread is considered a key transmission route for H. pylori. Several studies have provided evidence of clustering of infection within families. Some key points on transmission between family members:

  • Infected parents, especially mothers, are the likely source of infection for children
  • Higher prevalence seen between siblings and parents/children than unrelated household members
  • Spouses have increased risk of infection if their partner tests positive
  • Genotyping studies show family members harbor identical strains
  • Transmission appears highest between mothers, children, and siblings
  • Pre-chewing food for infants by infected mothers spreads it
  • Using utensils, toothbrushes, kissing relatives can spread oral secretions

While family history of H. pylori is a definite risk factor, it does not guarantee infection. Proper hygiene practices can help reduce transmission risk between family members.

Factors That Increase Risk of Transmission

Certain factors and living conditions can increase the risk of H. pylori spreading between family members:

  • Overcrowding – Higher household occupancy facilitates transmission
  • Poor sanitation – Easy spread with lack of clean water and proper sewage disposal
  • Low socioeconomic status – Related to overcrowding and sanitation
  • Parent infection status – Especially infected mothers
  • Pre-chewed food – Saliva on food chewed by infected parents can spread it
  • Contaminated utensils/toothbrushes – Using items of infected persons facilitates oral-oral spread
  • Kissing – Direct contact with saliva of infected relatives
  • Water source – Drinking contaminated water spreads fecal-orally

Proper hygiene like hand washing, avoiding sharing items like utensils and toothbrushes, and cleaning possible contaminated surfaces can help decrease risk of H. pylori transmission between family members.

Risk of Transmission Based on Relationship

Here is a table summarizing the risk of H. pylori transmission between infected family members and different relatives:

Relationship to Infected Person Risk of Transmission
Spouse Moderate risk
Parent to child High risk
Child to parent Low risk
Sibling to sibling High risk
Grandparent to grandchild Low risk
Cousins Low risk
Unrelated household members Low risk

As shown, the highest risk of transmission is between parents and children who have frequent close contact. Transmission between spouses is also significantly higher than other family ties. Proper hygiene practices are important for families with infected members to lower transmission chances.

Can You Reduce Transmission Risk at Home?

There are some steps families can take to lower the risk of spreading H. pylori infection between household members:

  • Improve sanitation and hygiene standards
  • Ensure access to clean drinking water
  • Prevent contamination during food prep – wash produce, cook meat thoroughly
  • Wash hands properly, especially before eating and after using bathroom
  • Don’t share utensils, cups, towels and other personal items
  • Clean bathrooms, kitchens regularly with disinfectant
  • Don’t chew food for babies if you are infected
  • Don’t kiss infants/children if you have active infection
  • Get infected family members treated to eliminate the bacteria

Treatment of infected family members, especially parents and siblings, can help break the chain of transmission. Using antibiotics to eliminate H. pylori in family members, combined with good hygiene practices, are the best ways to reduce spread within households.

Does H. pylori Go Away on Its Own?

No, H. pylori infection does not typically go away on its own without treatment. Some key points:

  • Chronic H. pylori infection can persist for life if left untreated
  • The body does not mount an effective immune response to clear the infection
  • Up to 20% of those infected may spontaneously clear the infection, often in the first year
  • Eradication rates with antibiotics are around 80-90% if properly taken
  • Confirming eradication with a stool antigen test or endoscopy is recommended

Due to the low rates of spontaneous clearance, active treatment with medications is necessary. A “test and treat” strategy is typically used – first confirming H. pylori infection with a breath or stool test, then prescribing antibiotics if positive.


In summary, H. pylori bacteria can definitely spread between family members through close contact in living situations. Parents, especially mothers, and siblings pose the highest risk of transmission to children. Spouses are also at increased risk of transmitting infection. Factors like overcrowding, poor hygiene, and contaminated food/water facilitate transmission. Proper sanitation and avoiding sharing personal items can reduce spread. Treatment of infected family members combined with good hygiene is key for controlling H. pylori infection within families. While the risk of transmission exists, it can be lowered with the proper precautions and control measures.