How is the hepatitis B virus transmitted by carriers?

Jan 03, 2025 Source: Cainiu Health

Dr. Gao Jun

Introduction

Under normal circumstances, hepatitis B virus (HBV) carriers mainly transmit the virus through maternal-infant transmission, blood and bodily fluid transmission, sexual contact, close daily contact, and iatrogenic transmission. It is advisable to avoid sharing personal items and not to share razors, toothbrushes, or other items that may lead to blood contact with others. At the same time, maintaining good personal hygiene habits can help reduce the chances of virus transmission.

Generally, hepatitis B virus (HBV) carriers mainly transmit the virus through mother-to-child transmission, blood and bodily fluids, sexual contact, close daily contact, and iatrogenic transmission. A detailed explanation is as follows:

1. Mother-to-child Transmission

HBV-carrying mothers may transmit the virus to the fetus or newborn through the placenta, blood, amniotic fluid, or breast milk during pregnancy, childbirth, or breastfeeding. This mode of transmission is difficult to completely avoid, but timely and effective mother-to-child blocking measures can significantly reduce the infection rate.

2. Blood and Bodily Fluid Transmission

The blood of HBV carriers contains high levels of the virus, and even a small amount entering a susceptible individual's body can cause infection. Blood transmission is a direct and efficient route of HBV transmission, including blood transfusions and blood products, injections, surgical procedures, needle-stick injuries, and similar routes. Additionally, sharing personal items such as razors and toothbrushes with infected individuals, as well as undergoing medical procedures like hemodialysis and organ transplantation, may also lead to HBV transmission.

3. Sexual Contact Transmission

Sexual contact is an important route of HBV transmission. In unprotected sexual activity, if one partner is an HBV carrier, the virus can be transmitted to the other partner through bodily fluids such as semen and vaginal secretions.

4. Close Daily Contact Transmission

Long-term close contact with HBV carriers, such as sharing eating utensils, towels, or other personal items, may also lead to HBV transmission. Although this mode of transmission is relatively rare, it still warrants attention and caution.

5. Iatrogenic Transmission

During medical examinations or treatments in hospitals, if medical instruments contaminated with HBV are reused without thorough disinfection, HBV transmission may occur.

In daily life, sharing personal items should be avoided, and individuals should not share razors, toothbrushes, or other objects that may result in blood contact. At the same time, maintaining good personal hygiene habits can help reduce the chances of virus transmission.

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What does it mean to be a hepatitis B virus carrier?

HBV carriers refer to individuals who have the hepatitis B virus present in their bodies but currently do not exhibit related symptoms. The virus typically exists during infancy or periods of weakened immunity and can persist long-term. However, when liver function tests are performed, the results usually appear normal, and there is generally little impact on health. Therefore, observation is recommended initially without special treatment, and medical treatment should be guided by a doctor if symptoms arise.

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Is the hepatitis B virus carrier negative or positive?

HBV carriers refer to individuals who have been infected with the hepatitis B virus but have not developed the disease. They may test positive for hepatitis B surface antigen (HBsAg) and hepatitis B core antibody (HBcAb), while tests for hepatitis B surface antibody (HBsAb), hepatitis B e antigen (HBeAg), and hepatitis B e antibody (HBeAb) may be either negative or positive.

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What symptoms do hepatitis B virus carriers experience when they fall ill?

Under normal circumstances, "hepatitis B virus" refers to the hepatitis B virus (HBV). When carriers of the hepatitis B virus develop symptoms, they may experience loss of appetite, fatigue, yellow urine, liver area pain, jaundice, and other symptoms. It is recommended to seek medical attention promptly. After confirming the cause, patients may follow their doctor's instructions to use medications such as entecavir dispersible tablets, tenofovir disoproxil fumarate tablets, lamivudine tablets, and others for treatment.

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Do chronic hepatitis B virus carriers transmit the virus?

Chronic hepatitis B carriers are also contagious. Although chronic hepatitis B carriers may not exhibit any symptoms and their liver function may remain normal without apparent damage, the hepatitis B virus is still present in their bodies. Therefore, during contact with a chronic hepatitis B carrier, it is possible to become infected. However, the likelihood of transmission varies among individuals.