please see the answers from http://www.medhelp.org/posts/Hepatitis-B/hepatits-b/show/1592144
as for if it is curable of not, unfortunately is no cure in this moment, the actual treatment is only for manage and to protect the liver, but not destroy the virus. Anyway it seams that new treatments are is on the horizon: like rep9ac or Myrcludex-B,for this keep an eye on http://www.medhelp.org/posts/Hepatitis-B/Entry-inhibitors-show-promise-as-drugs/show/1570784?page=1
HBV is very contagious to blood, so a goos advice will be that all your family should made a HBs screening and if they are not positive on the screening to receive a vaccine in order to be protected.
usually if a adult is infected with HBV it cure in 90% but if a newborn is infected (from mother) it will get chronic in 90% or if a child is infected also it will go chroninc in 70% or 60% depend on the age, so we can't know for sure from were we have it, and in this moment this is not something important
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