Is it necessary to get the hepatitis B vaccine?

Sep 03, 2025 Source: Cainiu Health

Dr. Gao Jun

Introduction

Under normal circumstances, it is necessary to receive the hepatitis B vaccine. Before vaccination, individuals should confirm their health status; if experiencing fever, acute illness, or an exacerbation of a severe chronic disease, vaccination should be postponed. After receiving the vaccine, individuals should remain on-site for 30 minutes for observation to check for any adverse reactions such as allergies. Following completion of the full vaccination schedule, regular monitoring of antibody levels in the body is recommended.

In general, it is necessary to receive the hepatitis B vaccine. The detailed explanation is as follows:

The hepatitis B vaccine can stimulate the body to produce specific antibodies. These antibodies can act when the hepatitis B virus invades, preventing viral infection of the liver and effectively reducing the risk of developing chronic hepatitis B. Whether for children, adults, or high-risk groups, receiving the hepatitis B vaccine can lower the risk of infection and reduce the likelihood of severe complications such as cirrhosis and liver cancer, making it an essential measure for protecting liver health. This is especially significant for individuals who have never been infected with the hepatitis B virus and lack antibodies in their bodies.

Before vaccination, individuals should confirm their health status. If there is fever, acute illness, or an acute exacerbation of a severe chronic disease, vaccination should be postponed. After receiving the vaccine, individuals should remain on-site for 30 minutes to monitor for any adverse reactions such as allergies. Following completion of the full vaccination schedule, regular testing of antibody levels in the body is recommended. If antibody titers are found to be insufficient, timely booster vaccination should be undertaken to ensure continued protective effects of the vaccine.

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How long can the second dose of the hepatitis B vaccine be postponed?

If the vaccination is postponed due to short-term unexpected situations such as a mild cold or temporary travel, it is sufficient to receive the missed dose within one month; there is no need to restart the entire vaccination series. The subsequent third dose should still be administered according to the originally planned interval and will generally result in normal production of effective antibodies. However, if the delay exceeds one month, especially beyond two months, the immune memory induced by the first vaccine dose may weaken.

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What should I pay attention to when receiving the hepatitis B vaccine?

Under normal circumstances, when receiving the hepatitis B vaccine, it is important to confirm your own health status, screen for allergies, follow the vaccination schedule, monitor for post-vaccination reactions, and be aware of contraindications for special populations. After vaccination, it is necessary to keep the injection site clean and dry, and avoid scratching. In daily life, maintaining a regular作息 (routine), balanced diet, and moderate exercise can help enhance physical immunity and improve the protective effects of the vaccine.

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How often should the hepatitis B vaccine be administered?

Under normal circumstances, the initial vaccination schedule for healthy individuals follows a 0, 1, 6 month program: the first dose is administered, followed by the second dose one month later, and the third dose five months after the second dose. Effective protective antibodies can be produced after completing the full vaccination series. Newborns, children, and adults who have never been infected with hepatitis B and test negative for antibodies should all follow this vaccination schedule.

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Which of the Five Hepatitis B Antigen-Antibody Tests Being Positive Is Considered Normal?

When all five hepatitis B tests are negative, it indicates that the body has not been infected with the hepatitis B virus (HBV) and has not developed protective antibodies. This is considered a healthy state; however, it also means there is no immunity against HBV. It is recommended to receive the hepatitis B vaccine promptly to gain protection and reduce the risk of infection. If only the surface antibody is positive, it usually indicates prior vaccination or recovery from a past HBV infection.

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How many years is the hepatitis B vaccine effective?

For individuals with normal immune function, protective antibodies generated after completing the full course of hepatitis B vaccination can remain stable for more than 10 years, during which time there is no need for frequent booster vaccinations. The daily risk of infection in this population is low, and antibody levels decline slowly, providing long-term protection against the hepatitis B virus. However, for individuals with weakened immune systems, such as the elderly, patients with chronic diseases, or those receiving immunosuppressive therapy,

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Is it normal for all the results of the hepatitis B surface antigen test (two pairs and a half) to be negative?

Under normal circumstances, the "two pairs and a half" for hepatitis B refers to the five indicators of serological testing for hepatitis B virus, and all negative results are considered normal. In daily life, one should avoid sharing personal items that may come into contact with blood, such as toothbrushes and razors, to reduce the risk of infection; it is recommended to receive the hepatitis B vaccine in a timely manner and complete the full vaccination schedule to promote the production of protective antibodies in the body.

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Does hepatitis B get passed on to the next generation?

Hepatitis B usually refers to chronic hepatitis B. Under normal circumstances, chronic hepatitis B is not inherited by the next generation. However, the virus can be transmitted to offspring through mother-to-child transmission or close contact. Women planning pregnancy should consult healthcare professionals in advance to assess their condition and develop a mother-to-child transmission prevention plan. During pregnancy, appropriate interventions should be carried out as directed. Newborns should receive hepatitis B vaccine and hepatitis B immune globulin promptly after birth.

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If there is no antibody for hepatitis B, is it necessary to receive the vaccine?

In general, individuals without hepatitis B antibodies are advised to receive the hepatitis B vaccine, especially those at risk of infection, as this can effectively reduce the likelihood of contracting the hepatitis B virus. In daily life, it is also important to avoid sharing items such as needles and toothbrushes that may come into contact with blood, in order to minimize the risk of infection. By getting vaccinated and taking proper precautions, one can better protect liver health.

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