The majority of people who receive the Hepatitis B Vaccine
(65%) do not experience any reactions to it.
About 3% of those immunized will develop pain and tenderness where the shot was given; low-grade fever occurs in about 1% to 6% of vaccine recipients.
Serious reactions are "extremely rare." in far less than 1 out of 10, 000 shots given, or about .001%, a serious allergic reactions may occur.