A vote on the hepatitis B vaccine for newborns has been pushed to Friday. Advisors say the wording kept changing, and they were confused about exactly what they were being asked to vote on.

The decision could affect long-standing guidance on the hepatitis B shot.

Since 1991, the Advisory Committee on Immunization Practices has recommended that every newborn get the hepatitis B vaccine within 24 hours of life. Its been incredibly effective. Pediatric hepatitis B infections have dropped by 99%, from 16,000 to less than 20.

So whats behind this discussion? A proposal earlier this year suggested delaying the dose for babies whose mothers test negative for hepatitis B. Discussion included recommending individual-based decision-making between mothers and their doctors.

But heres the challeng

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