Hepatitis B Risks and Vaccination for Family Members - Gastroenterology and Hepatology

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Regarding Hepatitis B and the Hepatitis B vaccine?


Hello Doctor, I have not yet been tested, so I cannot confirm whether I have hepatitis B.
If I do, my 48-year-old mother has eaten leftovers from my meal, and other family members may have been exposed to my saliva (a small amount).
My mother has likely never received the hepatitis B vaccine.
Should my mother seek medical attention immediately to receive the vaccine to reduce her risk of contracting hepatitis B? I have also heard about hepatitis B immune globulin; can it be administered? If I confirm that I have hepatitis B, can my mother still receive the vaccine? I am really very worried, and I sincerely ask for your help, thank you, Doctor.

Ping An, 20~29 year old female. Ask Date: 2016/10/21

Dr. Chen Shidian reply Gastroenterology and Hepatology


Hello, Miss.
Hepatitis B is transmitted through blood, not through food.
Since 1984, all newborns have been vaccinated against Hepatitis B, so there is no need to worry.
Changhua Hospital cares about your health.
Chen Shidian.

Reply Date: 2016/10/21

More Info


Hepatitis B is a viral infection that primarily spreads through contact with infectious body fluids, particularly blood. It is important to clarify that Hepatitis B is not transmitted through casual contact, such as sharing food or drinks, or through saliva. Therefore, if your mother consumed leftover food that you had eaten, the risk of her contracting Hepatitis B from that situation is extremely low.

In your case, since you have not yet been tested for Hepatitis B, it is crucial to get tested as soon as possible. If you are found to be positive for Hepatitis B, your mother should indeed consider vaccination, but it is important to understand the timing and context of vaccination and the use of immunoglobulin.

1. Vaccination: The Hepatitis B vaccine is highly effective in preventing infection. If your mother has never been vaccinated, she should receive the vaccine series. The vaccine is typically given in three doses over a six-month period. The first dose can be administered as soon as possible, followed by the second dose one month later, and the third dose six months after the first dose.
2. Hepatitis B Immunoglobulin (HBIG): In certain situations, such as after potential exposure to the virus, HBIG can be administered along with the vaccine to provide immediate, short-term protection. However, this is usually recommended for individuals who have had a known exposure to Hepatitis B, such as through sexual contact with an infected person or through blood exposure. In your case, since the exposure is not direct and is not considered high-risk, HBIG may not be necessary.

3. Testing for Family Members: It would be prudent for your family members, especially those who may have been in close contact with you, to get tested for Hepatitis B. This includes checking for Hepatitis B surface antigens (HBsAg) and antibodies (anti-HBs). If they are found to be negative and have not been vaccinated, they should also consider vaccination.

4. Understanding Transmission: Hepatitis B is primarily transmitted through blood, sexual contact, and from mother to child during childbirth. It is not spread through casual contact, sharing utensils, or through food. Therefore, your concerns about your mother eating your leftover food or coming into contact with your saliva are largely unfounded.

5. Monitoring and Follow-Up: If you are diagnosed with Hepatitis B, it is essential to follow up with a healthcare provider for regular monitoring. Chronic Hepatitis B can lead to serious complications, including liver cirrhosis and liver cancer, so early detection and management are key.

In summary, while your mother should consider getting vaccinated against Hepatitis B if she has not been vaccinated before, the risk of transmission through the scenarios you described is very low. It is advisable for you to get tested for Hepatitis B and for your family members to be informed about their vaccination status and the importance of testing. If you have further concerns, consulting with a healthcare provider specializing in infectious diseases or hepatology would be beneficial.

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