Editor—Hepatitis B continues to be a public health problem despite the existence, for the past decade, of a safe and effective vaccine. Particular concern exists for infants at risk of vertical transmission. The Department of Health recommends that all babies born to mothers who are hepatitis B carriers receive hepatitis B immunisation at birth, 1 month, 6 months, and 12 months of age. Universal screening of pregnant mothers for hepatitis B has been in place in Cardiff since 1995. We were concerned that, although babies received immunisation at birth, second and third doses were being missed. An audit was therefore undertaken to assess the coverage of hepatitis B immunisation in infants at risk born between 1 January 1994 and 31 December …