How many doses of the hepatitis B vaccine are required?

The standard hepatitis B vaccination schedule consists of three doses administered at birth (0), one month (1), and six months (6) after birth. Here, “0” refers to the time point of the first dose (i.e., at birth); “1” indicates the second dose given one month after the first; and “6” denotes the third dose administered six months after the first.

Vaccinations can be obtained at local community health centers or Centers for Disease Control and Prevention (CDC). However, hepatitis B vaccination does not confer lifelong immunity. After completing the vaccination series, it is essential to assess vaccine efficacy and measure serum hepatitis B surface antibody (anti-HBs) titers.If the anti-HBs titer falls below the protective threshold of 10 mIU/mL, a booster dose should be administered promptly to maintain an effective anti-HBs titer and thereby ensure reliable protection against hepatitis B virus infection. It is recommended to test anti-HBs titers one month after completing the three-dose vaccination series to determine whether a booster dose is needed.