乙型肝炎
Hepatitis B vaccination, hepatitis B immunoglobulin, and the combination of hepatitis B vaccine plus hepatitis B immunoglobulin, all are considered as preventive for babies born to mothers infected with hepatitis B virus (HBV). The combination is superior for protecting these infants. The vaccine during pregnancy is not considered to be valuable in protecting babies of the infected mothers. Hepatitis B immunoglobulin before birth has not been well studied.