The '''Hepatitis B vaccine''' is a vaccine which is effective in preventing Hepatitis B in both pre and post exposure cases in 80 - 95% of cases. It is required by most states of children in order to be admitted to [[public school|public]] [[school]]. One study has proposed that the vaccine may increase the risk of [[multiple sclerosis]], though additional studies have not found any correlation, and neither the World Health Organization nor Centers for Disease Control regard the vaccine as unsafe. It is required of schoolchildren based on the recommendations of the World Health Organization and Centers for Disease Control. | The '''Hepatitis B vaccine''' is a vaccine which is effective in preventing Hepatitis B in both pre and post exposure cases in 80 - 95% of cases. It is required by most states of children in order to be admitted to [[public school|public]] [[school]]. One study has proposed that the vaccine may increase the risk of [[multiple sclerosis]], though additional studies have not found any correlation, and neither the World Health Organization nor Centers for Disease Control regard the vaccine as unsafe. It is required of schoolchildren based on the recommendations of the World Health Organization and Centers for Disease Control. |