Levi praised a 2004 study from Guinea-Bissau, an outlier that suggested that babies, especially females, were more likely to die if they got a hepatitis B shot. Nurse Vicky Pebsworth of the National Vaccine Information Center, which opposes all vaccine mandates, frequently brought her own selective research into the meeting. Nor could anyone provide a clear answer as to what prompted the committee’s discussion and planned vote on the birth dose of hepatitis B vaccine, since there was no new evidence suggesting any harm from it. He appeared to nod off during a CDC staff presentation on the safety of the hepatitis B shot. It postponed its vote on the hepatitis B birth dose.