If one forgets to take the third dose of the hepatitis vaccine, can a booster dose be given?

Q: We forgot to give the third dose of the Hepatitis-B vaccine to our son who is 5 years and 3 months old. Can we give him a booster dose now? Please suggest.

A:You can safely give the third dose of hepatitis vaccine now (no booster is required for hepatitis B), otherwise the child will not be immunised fully against hepatitis B.