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Pregnancy and Hepatitis B

 

The hepatitis B virus can cause an acute (lasting less than 6 months) or chronic (lifetime) infection. Chronic infection occurs in 90% of infants infected through mother-to-child transmission at birth; and about 50% of children will develop a chronic infection if exposed to the virus between 1 and 5 years of age. Those infected as adults are much less likely (<5%) to develop a chronic infection. Left untreated, hepatitis B can progress to cirrhosis and other serious liver diseases like liver cancer. This blog will talk about mother-to-child (perinatal) transmission and commonly asked questions about perinatal transmission.

Transmission of Hepatitis B from Mother to Child

Globally, the most common route of transmission is mother-to-child. Some people might think the hepatitis B virus is transmitted genetically, but this is NOT true. Hepatitis B is a virus that can be transmitted from a mother to her child because of the blood exchange that happens during childbirth. The great news is that we can prevent mother-to-child transmission! If a pregnant woman tests positive for hepatitis B infection, then her newborn must be given proper prevention immediately after birth in the delivery room, clinic or bedside:

  • first dose (called “birth dose”) of the hepatitis B vaccine
  • one dose of the Hepatitis B Immune Globulin (HBIG).*

*HBIG is recommended by U.S. CDC. HBIG is not recommended by WHO and may not be available in all countries. What is most important is to make sure the hepatitis B vaccine birth dose is given as soon as possible!

If these two medications are given correctly, a newborn born to a mother with hepatitis B has a 95% chance of being protected from a hepatitis B infection. You must make sure your baby receives the remaining shots of the vaccine series according to schedule to ensure complete protection.

And there is more good news – if a pregnant woman with hepatitis B has a high viral load during pregnancy, it is recommended that she take antiviral therapy during her third trimester, which will further reduce the risk of mother-to-child transmission. If you are pregnant and have hepatitis B, talk to your doctor about testing your HBV DNA level, and starting antiviral treatment if it is elevated. There are WHO guidelines for managing hepatitis B infection among pregnant women, which your doctor can use to guide your care.

Commonly Asked Questions About Perinatal Transmission

I am pregnant, should I be tested for hepatitis B?

ALL pregnant women should be tested for hepatitis B. Testing is especially important for women who fall into high-risk groups such as health care workers, women from ethnic communities or countries where hepatitis B is common, spouses or partners living with an infected person, etc. If you are pregnant, be sure your doctor tests you for hepatitis B before your baby is born, ideally as early as possible during the first trimester.

I have hepatitis B and I am pregnant, what should I do?

You already know your hepatitis B status – this is a great first step! The next thing you should do is tell your medical provider who should perform additional laboratory testing, including HBV DNA level (viral load), and should check to see if there is evidence of cirrhosis.

All pregnant women who are diagnosed with hepatitis B should be referred to care with a knowledgeable doctor. Some may require continued treatment with an antiviral, many will not. All women with hepatitis B need regular monitoring throughout their life since hepatitis B infection and the health of the liver can change over time.

Can I transmit hepatitis B to my baby when I am breastfeeding?

The U.S. Centers for Disease Control and Prevention (CDC) and World Health Organization (WHO) recommend that all women with hepatitis B should be encouraged to breastfeed their newborns.  

*Especially if your baby has received the hepatitis B vaccine birth dose, the benefits of breastfeeding outweigh any potential risk.*

Can I prevent my baby from contracting hepatitis B?

Yes! In all cases, it is very important that your obstetrician (or provider who will be delivering your baby), and your newborn’s pediatrician, are aware of your hepatitis B status to ensure that your newborn receives the proper vaccines at birth to prevent a lifelong hepatitis B infection and that you receive appropriate follow-up care.

Should I continue to see a doctor after I give birth?

Yes! Women who have hepatitis B should be closely monitored for 6 months after delivery whether they have been prescribed antivirals are not. This will ensure there are no dangerous elevations in liver enzymes, which can indicate liver damage (ALT flares). For most women whose follow-up testing shows no signs of active disease or cirrhosis, your physician will recommend regular monitoring with a liver specialist (hepatologist) or doctor with experience managing the care of people with hepatitis B. 

World Health Organization Recommendations

In 2020, The World Health Organization released two new recommendations for the prevention of mother-to-child transmission of hepatitis B.

  1. In addition to the series of hepatitis B vaccinations (including the first dose within 24 hours of birth), WHO now recommends that pregnant women testing positive for HBV infection (HBsAg positive) with an HBV DNA viral load threshold of ≥5.3 log10 IU/mL (≥200,000 IU/mL) receive tenofovir prophylaxis; the preventive therapy should be provided from the 28th week of pregnancy until at least birth.
  2. In settings where HBV DNA testing is not available, WHO now recommends the use of HBeAg testing as an alternative to determine eligibility for tenofovir prophylaxis for the prevention of mother-to-child transmission of HBV  This is because some settings have poor access to tests that quantify an individual’s HBV viral load and determine whether a pregnant woman would be eligible for preventive treatment or prophylaxis. This is especially the case in low-income settings or rural areas where many antenatal care visits take place.

Author: Evangeline Wang

Contact Information: info@hep.org

Expert Calls for Viral Load Testing in All Pregnant Women with Hepatitis B

Dr. Ravi Jhaveri, an infectious disease specialist at the University of North Carolina at Chapel Hill School of Medicine, talks to parents.
Dr. Ravi Jhaveri, an infectious disease specialist at the University of North Carolina at Chapel Hill School of Medicine, talks to parents.

Today, all pregnant women are routinely screened for hepatitis B, but a growing number of doctors say this single test doesn’t go far enough to protect the health of women and children.

In a commentary published in the medical journal Pediatrics,  infectious disease specialist Dr. Ravi Jhaveri calls for a mandatory second test in pregnant women infected with hepatitis B. This test would measure the amount of hepatitis B virus (HBV) in her body (called viral load).

When women have high viral loads, their newborns can become infected even if they are immunized at birth and treated with HBIG (hepatitis B antibodies) to prevent infection. Continue reading "Expert Calls for Viral Load Testing in All Pregnant Women with Hepatitis B"

High Viral Load, HBeAg Positivity Increased Risk for Mother-to-Infant HBV Transmission

The study published by Healio Hepatology, March 8, 2013 discusses the increased risk of mother-to-infant transmission in HBV positive moms who are HBeAg positive and have a high viral load. Current prophylaxis, where infants of HBsAg+ moms receive the first shot of the HBV vaccine and a shot of HBIG within 12 hours of birth, is successful greater than 90% of the time. However, according to the study, HBeAg+ pregnant moms with a viral load above 10cp/mL(10,000,000 cp/mL) will transmit the virus to their infant despite prophylaxis. Since a particularly elevated viral load appears to determine the failure of current prophylaxis, the need for additional screening for these women and revised intervention strategies is necessary to prevent transmission to their babies at birth.

If you are a pregnant mom that is HBsAg+, please see a liver specialist for further evaluation to determine your HBeAg status and your HBV DNA viral load. If you are HBeAg + and have a high viral load, (a viral load near the 10,000,000 cp/ml threshold) you will want to talk to your liver specialist to determine if you and your baby would benefit from antiviral therapy in order to prevent transmission of HBV to your newborn. Although there are no official guidelines or recommendations, Registry data shows medications for hepatitis B appear safe during pregnancy. Talk to your doctor to see if this is a good option for you and your baby.

If you are a pregnant woman, please read and print HBF’s Chronic Hepatitis B in Pregnancy, and give it to the doctor who will be caring for you during your pregnancy. Sadly, IOM data shows HBV+ women in the U.S. are not always identified and educated about their HBV, and an opportunity for prophylaxis may be missed despite CDC recommendations that ALL infants receive the first dose of the HBV vaccine prior to hospital discharge.

If you live in a developing country, there may be no guidelines in place that automatically screen pregnant women for hepatitis B. Once again, read and print a copy of “Chronic Hepatitis B in Pregnancy” for your doctor. Insist you are screened for HBV, and if you are HBsAg+, please be sure prophylaxis will be available at the hospital where you will give birth to your baby. If you find you are HBeAg+, with a high viral load, please speak to a liver specialist to see if an antiviral is an option for you to prevent HBV transmission to your baby. Don’t’ forget to have your baby tested at 18 months to ensure your baby is HBV free.

*Please note you can convert copies per milliliter (cp/ml) to IU/mL for the article below using WHO’s international standard where 1 IU/mL = 5.2 copies/mL. Please ask your doctor or your lab if you have specific questions regarding the conversion.


Infants born to mothers with a high hepatitis B viral load, particularly those positive for hepatitis B e antigen, are at high risk for contracting hepatitis despite immunoprophylaxis, according to recent results.

Researchers evaluated 303 mother-infant pairs in which mothers tested positive for hepatitis B surface antigen (HBsAg). Maternal viral load and hepatitis B e antigen (HBeAg) status were determined, and children were tested for HBsAg at ages 4 to 8 months (n=250) and/or 1 to 3 years (n=53 for an initial test; n=183 for a follow-up test). All children received HBV vaccine within the first week of birth and at 1 and 6 months, with a 100% completion rate; children born to mothers who tested positive for HBeAg received hepatitis B immunoglobulin within 24 hours of birth.

HBeAg-positive mothers (81 cases) had higher viral loads than those who did not (7.4 ± 1.9 log10 copies/mL vs. 2.7 ± 1.4 log10 copies/mL; P<.0001 for difference). Chronic HBV infection was identified in 10 children, all born to HBeAg-positive mothers with high viral loads (range 6.5-9.5 log10 copies/mL), and all with the same HBV genotypes and subtypes as their mothers.

Investigators identified a significant association between maternal viral load and a child’s risk for infection via multivariate analysis, after adjusting for factors including age; birth type; infant gender, weight and gestational age, and feeding practices (adjusted OR=3.49; 95% CI, 1.63-.7.48 per log10 copy/mL increase). Predictive rates for maternally transmitted HBV infection were found to be statistically significant at 7 (6.6%; P=.033), 8 (14.6%; P=.001), and 9 (27.7%; P<.001) log10 copies/mL.

“High maternal viral load is the most important factor causing maternally transmitted HBV infection, and is significantly correlated with maternal HBeAg status,” the researchers wrote. “Our predictive model including multiple risk factors showed that children with a maternal viral load above 10,000,000 to 100,000,000 copies/mL (or would have a significant risk of infection despite immunoprophylaxis. Our data provide important information for the rational design of future screening and intervention strategies to further reduce maternally transmitted HBV infection.”

Wen W-H. J Hepatol. 2013;doi:10.1016/j.jhep.2013.02.015.

March 8, 2013