This year, an "easy-to-miss" but significant change was made to the timing of the first dose of hepatitis B vaccine (HepB birth dose) when administered to infants born to women who are not infected with the hepatitis B virus (HBV), i.e., women who are hepatitis B surface antigen (HBsAg)-negative.

Here is the side-by-side comparison:

In the 2016 schedule (page 4), the first bullet in the footnote for hepatitis B vaccine read: "At birth: Administer monovalent HepB vaccine to all newborns before hospital discharge."

In the 2017 schedule (page 5), the first bullet in the same footnote section reads: "At birth: Administer monovalent HepB vaccine to all newborns within 24 hours of birth."

This modification was adopted during the October 2016 ACIP meeting, when the committee voted to recommend administration of the "birth dose" in the 24-hour window immediately after birth. This change re-emphasizes the importance of the timeliness of this dose as a safety net to protect newborns from becoming infected with hepatitis B at birth and developing chronic HBV disease later in life. Furthermore, the new guidance removed previous policy language that allowed for delays in administering the birth dose "on a case-by-case basis and only in rare circumstances" (see page 17, ACIP hepatitis B recommendations, December 2005).

On March 6, CDC posted additional information about the HepB birth dose guidance on its Child and Teen Immunization Schedule web page (see “Changes to the Schedule" section), which provides clarifications about the recommendations for infants whose mothers' HBsAg status is unknown or positive and for low birth weight infants:

• Monovalent hepatitis B vaccine should be administered within 24 hours of birth for medically stable infants weighing = 2,000 grams born to hepatitis B surface antigen (HBsAg)-negative mothers. The recommendations for vaccination of infants < 2,000 grams (as well as infants born to HBsAg-positive mothers or mothers whose hepatitis B status is unknown) remain unchanged.
• Preterm infants weighing < 2,000 g born to HBsAg-negative mothers should receive the first dose of vaccine one month after birth or at hospital discharge.

The clarification concludes by noting that “Additional detail regarding hepatitis B vaccination of infants born to HBsAg-positive mothers or mothers whose hepatitis B status is unknown can be found in the ACIP hepatitis B recommendations.”

CDC resource