What is the probability of giving birth a sick child if the father is sick with hepatitis B in the chronic form? Can this be avoided?

Respond Stanislav Y. Karpov, hepatology, gastroenterology, hepatology and gastroenterology clinic Medal father can not infect an unborn baby. Only the mother during pregnancy or childbirth, if she is infected with hepatitis B. A similar question: My boyfriend is infected with chronic hepatitis B. I was vaccinated. What is the probability of a sick child birth?