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A study of 158,169 children under 5 found that, among children living with someone identified as having active hepatitis B, 58.2% had a nonmaternal household contact with the infection. The findings highlight household exposure beyond mothers as the CDC vaccine advisory committee shifts toward shared decision-making on the birth dose for infants whose mothers test negative.
A study of 158,169 children under age 5 found that most identified household exposures to active hepatitis B involved someone other than the child’s mother, a finding relevant to the debate over whether all newborns should receive a hepatitis B vaccine dose at birth. Of children living in a household with an identified active infection, 58.2% had a nonmaternal household contact with hepatitis B, researchers reported at the IDWeek meeting.
Karen Jacobson, MD, MPH, of the Kaiser Permanente Vaccine Study Center, and colleagues reviewed laboratory and vaccination records for children enrolled in Kaiser Permanente Northern California. The children lived in 131,800 households; 1,689 households had at least one member identified as having active hepatitis B. Overall, 1.3% of the children lived in a household with such a person.
Among identified household exposures, 41.8% involved the child’s mother and 58.2% involved another household contact. The study also found that 4.2% of children exposed through a nonmaternal household contact had not been vaccinated by age 30 days. Under the CDC Advisory Committee on Immunization Practices’ revised approach, the first dose may be delayed until at least age 2 months for infants whose mothers test negative and whose families choose not to vaccinate at birth.
Testing and vaccination records differed by exposure type. While 95% of birth-exposed infants were tested for hepatitis B, only 3.6% of children with household exposures were tested. All birth-exposed children in the study received a vaccine dose within seven days of birth. Children with household exposure were more likely to have been vaccinated than children without identified exposure—93.5% compared with 86.7%—but those figures do not establish that vaccination was prompted by knowledge of a specific exposure.
Household Contacts Extend Exposure Risk
The findings show why a prevention policy based only on a mother’s test result may not account for every possible source of hepatitis B exposure in a child’s household. A father, grandparent, or another person living with the infant could have an active infection. The study does not establish how many children would become infected if birth-dose vaccination rates fell, but it identifies a group of potential exposures that maternal screening alone would not capture.
The timing matters because the committee’s approach allows a delay in the first dose for some infants, while the study found that a portion of children with nonmaternal household exposure remained unvaccinated at 30 days. Jacobson said transmission from nonmaternal sources is currently rare in the United States because vaccination rates are high, while warning that lower rates could leave more infants vulnerable. The research did not measure a change in infections or prove that the policy change will cause them.
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Birth-Dose Policy and Study Design
In December, the CDC’s Advisory Committee on Immunization Practices voted to stop recommending a universal hepatitis B vaccine birth dose for infants whose mothers test negative for hepatitis B surface antigen, or HBsAg. The committee continues to recommend a dose within 12 hours of delivery when the mother tests positive or has not been screened. For infants whose mothers test negative, the committee called for shared decision-making; if a birth dose is not given, it recommended beginning the three-dose series at age 2 months or later.
The study used Kaiser Permanente Northern California laboratory and vaccination records through March. Researchers linked children to their birth mothers and household members using addresses, with household contacts identified through membership in the same health system. This design allowed the team to identify recorded infections and vaccination patterns, but it did not provide a complete census of all people living with each child or determine whether exposed children later developed hepatitis B.
Critics of ending the universal recommendation have warned that fewer birth doses could lead to preventable infections and related long-term harms. A separate modeling study cited in the source report projected an 83% increase in chronic infections under a shared-decision approach. That is a model estimate, not an observed outcome from Jacobson’s study.
“Our findings show that even if it is possible to accurately identify every single maternal infection, this would not account for potential exposure to an infected father, grandparent, or another person living in the household.”
— Karen Jacobson, MD, MPH, of the Kaiser Permanente Vaccine Study Center
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Infections and Exposure Counts Remain Unknown
The researchers could not determine whether any of the children with identified household exposure became infected, because children are not routinely screened for hepatitis B. The study therefore measures recorded household infection and vaccination patterns, not the number of infections caused by those contacts or the effect of the policy change on future cases.
The 1.3% exposure estimate may be an underestimate. Household members with hepatitis B may not have been Kaiser Permanente members, addresses may have been inaccurate, and the records could miss other close contacts outside the home. The study also covered one health system in Northern California, so the findings may not reflect every U.S. population. The source report did not provide a journal publication or a full account of the study’s statistical methods.
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Policy Debate Awaits Outcome Data
The study was presented at the IDWeek annual meeting. The available report does not say whether the findings have been published in a peer-reviewed journal or identify a next scheduled analysis. The policy question will continue to turn on how families and clinicians apply shared decision-making and whether vaccination patterns change under the revised recommendation.
Further research would be needed to establish how often nonmaternal household exposures lead to infection, whether birth-dose coverage declines, and what effect any decline has on infant cases. Until those outcomes are measured, Jacobson’s study adds evidence about the range of possible exposure sources but does not quantify the consequences of the policy change.
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Key Questions
What did the study find?
Among children under 5 living in a household with someone identified as having active hepatitis B, 58.2% had a nonmaternal household contact with the infection, while 41.8% had an infected mother.
How many children were included?
The researchers studied 158,169 children under age 5 enrolled in Kaiser Permanente Northern California. They found 1,689 households with at least one member identified as having active hepatitis B.
What changed in the birth-dose recommendation?
The CDC advisory committee continues to recommend a birth dose within 12 hours when a mother tests positive for hepatitis B or has not been screened. For infants whose mothers test negative, it shifted to shared decision-making; if the birth dose is deferred, the first dose is recommended at age 2 months or later.
Did the study show that the policy change will cause more infections?
No. The study identified household exposure and vaccination patterns but could not determine whether exposed children became infected or predict the policy’s effect on future infection rates.
Why might the reported exposure rate be an underestimate?
Some infected household contacts may not have been Kaiser Permanente members, and address information may have been inaccurate. The study also could not capture every possible close contact outside the household.
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