Up to 50% of hepatitis B cases are attributed to perinatal transmission from mother to infant, which can occur at or around birth.
Notes on verification
Confirmed by multiple independent peer-reviewed and clinical sources (AJOG, StatPearls/NCBI, PMC reviews), with estimates ranging 35-50%+ depending on region, consistent with the claim's 'up to 50%' framing. [tier=silver indep_score=0.925 clusters=2 claim_tier=notable]
Sources
- CDC Officially Ends Recommendations for Hepatitis B Shot ... (seed:health_and_medicine)
- https://www.ajog.org/article/s0002-9378(15)01214-4/fulltext (corroboration)
- https://www.ncbi.nlm.nih.gov/books/NBK556026/ (corroboration)
- https://pmc.ncbi.nlm.nih.gov/articles/PMC9013253/ (corroboration)
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3304633/ (corroboration)