For some people, the hepatitis B virus causes mild illness and resolves within a few weeks. For others, it is potentially life threatening and can result in lifelong health complications as it inflames and damages the liver. However, some individuals can build immunity to hepatitis B through vaccination.
The hepatitis B virus, or HBV, can cause hepatitis B infection in some people. The
HBV transmits through contact with blood or other bodily fluids from people who have the virus. It can also be transmitted from birth parent to infant during labor.
There is a safe and effective hepatitis B vaccine that helps a person build immunity against HBV infection.
Learn more about hepatitis B, including what it means to have immunity and how the hepatitis B vaccine can provide immunity to some people.
Hepatitis B is a liver infection caused by HBV. For some people, HBV infection can
Individuals can contract hepatitis B via blood, semen, and other bodily fluids from a person who has the virus. For example, this can happen during birth, through sexual contact, or by sharing needles, syringes, or other drug equipment.
People who have HBV may experience the following symptoms:
The risk of developing chronic HBV depends on the age at transmission. The
There are approved drugs for adults and children that help control the hepatitis B virus, such as antivirals. While this reduces the risk of developing more serious liver disease, there is still no complete cure.
Sometimes, a person’s immune system can clear HBV infection without treatment. Experts are unsure why some people may have a natural immunity to HBV.
However, hepatitis B infection can become long term for others and lead to serious health problems, such as liver cirrhosis and cancer.
All infants, children, and adults should receive hepatitis B vaccination. People exposed to the virus may also receive the hepatitis B vaccine within 24 hours, which can prevent infection in some cases.
The vaccine can offer long-term protection against HBV.
The course for infants
- a first dose at birth
- a second dose before 2 months
- a third dose at 15 months
Most healthy people do not require any further vaccinations.
If adults did not receive hepatitis B vaccination at birth, the
Some people may receive boosters, such as those on hemodialysis whose test results show that antibodies to hepatitis B surface antigen have fallen by <10 milli-international units per milliliter.
The hepatitis B vaccine is safe and well-studied. Most people experience no adverse effects following vaccination. However, mild side effects may
In some rare cases, an individual may experience a severe allergic reaction to the hepatitis B vaccine. If an individual develops any of the following signs, they should seek emergency medical treatment:
Doctors must closely monitor pregnant people who have HBV.
There is a risk that the virus can pass from parent to child during delivery without the correct treatment. Therefore, all people should receive hepatitis B testing during pregnancy. A person with chronic hepatitis B should talk with a doctor about the risks and benefits of antiviral treatment while pregnant.
According to the Hepatitis B Foundation, if someone has HBV, their newborn must immediately receive the first dose of the hepatitis B vaccine and hepatitis B immune globulin (HBIG) within 12 hours of birth. The infant should then receive the second and third doses of the vaccine according to the standard childhood immunization schedule.
Pregnant people unsure of their vaccination status can
However, there is currently not enough safety information about Heplisav-B and PreHevbrio, so pregnant people
Doctors may order a panel of blood tests to check if someone has HBV:
- Hepatitis B surface antigen (HBsAg): This test looks for the presence of HBV in the blood by looking for antigens found on the virus. A positive result means that a person has HBV.
- Hepatitis B surface antibody (anti-HBs): This test can show if a person is immune and protected against HBV. A positive result indicates that the person has overcome a past HBV infection or it is the result of receiving the hepatitis B vaccine.
- Hepatitis B core antibody (anti-HBc): This test looks for another antibody in the HBV, but this one does not provide protection. A positive result indicates that a person had a past infection or currently has HBV.
Some people with certain risk factors for hepatitis B infection, such as those who inject drugs, pregnant people, and other populations, may require testing postvaccination to check their immunity.
Some individuals may complete hepatitis B vaccination and not develop protective antibodies. Doctors refer to these people as nonresponders.
Another reason is that a person may already have had HBV. Therefore, doctors may test for the hepatitis B surface antigen or HBsAg before deciding they are a vaccine nonresponder.
If someone does not respond to the primary hepatitis B vaccine series, they should complete a second series with a different brand of vaccine. Doctors may also recommend a 2-dose vaccine schedule if someone does not respond to the initial hepatitis B vaccine schedule.
Doctors should check anyone revaccinated around 1–2 months following the last dose of the schedule to determine if their antibodies have responded.
The World Health Organization (WHO)
Other ways to prevent transmission of the virus can include:
- using barrier contraception during sex
- limiting sexual partners
- avoiding sharing needles or personal items such as toothbrushes and razors
Hepatitis B is an infection caused by the hepatitis B virus. For some people, it can cause serious liver damage, cirrhosis, and cancer if left untreated. People can contract HBV infection through contact with bodily fluids from someone who has the virus.
There is a safe and effective hepatitis B vaccine that most people receive at birth. However, should someone acquire chronic HBV, doctors may treat it with antiviral medications or other drugs to boost the immune system, though there is no complete cure.