How much is actually needed a 9-year old child vaccination geppatita B? There is a further negative impact of a large number of vaccinations?

Respond Tatyana Stepanova, a gastroenterologist, hepatologist child needs immunity to hepatitis B virus become infected with this virus can be manipulated for medical and dental interventions, etc. In addition, after inoculation develops immunity, ie protection against virus period of not less than 10 years. Similar question: whether or not to ... 17-year old child vaccinated against hepatitis A (vaccinated against hepatitis-B have already been made). How this vaccine is safe? Can ...