Hepatitis B prophylaxis of infants born to mothers with no antenatal care: Understanding the nuances in Canada
Bibliographic record
Abstract
We thank Dr’s. Zhou and Zhao for their thoughtful comments on our recently published guideline “Reducing perinatal infection risk in newborns of mothers who received inadequate prenatal care” (1). We agree that hepatitis B surface antigen (HBsAg) testing of the newborn infant is of limited utility in detecting infant infection and should not guide immediate infant management. However, when the mother is not available for testing, anti-HBs and HBsAg testing of the infant can be helpful, primarily for establishing maternal immunity status. We have made adjustments to Table 2 (2) to reflect the nuances of interpreting these test results in the neonate. As shown in Figure 2 (2), immediate management of the infant depends solely on maternal test results and not on infant test results. The studies the authors quote with remarkably low hepatitis B virus (HBV) transmission rates provided both vaccine and hepatitis B immunoglobulin (HBIg) very soon after birth; the need for rapid administration of both products is yet to be proven. However, we agree that all infants whose mothers have reactive HBsAg, should, in addition to vaccine, receive HBIg within 12 h of birth (as illustrated in Figure 2). When maternal status is unknown, the approach is more nuanced. In the ideal circumstance, STAT maternal testing can guide management with HBIg being administered within 12 h of birth when maternal HbsAg is determined to be reactive. However, when maternal tests results cannot be obtained in a timely manner (such as for some women delivering in remote communities) it is in our view reasonable, in the context of a low HBV prevalence setting such as Canada, to administer HBV vaccine as soon after birth as possible and defer HBIg administration for up to 7 days pending maternal test results for infants weighing ≥2000 g (3,4). When the mother is not available for testing, the decision to administer HBIg should be based on a careful evaluation of maternal risk. In order to make this more clear we have added the following footnote to Figure 2 of the online version of the document (2): “When a mother with unknown HbsAg status is not available for testing, HBV vaccine is indicated within 12 hours of birth; administration of HBIg should also be considered depending on maternal risk assessment.”
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.004 | 0.037 |
| Meta-epidemiology (narrow) | 0.000 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.004 | 0.002 |
| Scholarly communication | 0.003 | 0.002 |
| Open science | 0.002 | 0.002 |
| Research integrity | 0.003 | 0.005 |
| Insufficient payload (model declined to judge) | 0.003 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".