Hepatitis B vaccines are highly effective in preventing infection with the hepatitis B virus (HBV). According to the World Health Organization (WHO), the hepatitis B vaccine is over 95% effective in preventing HBV infection and its chronic consequences, such as liver cirrhosis and liver cancer.
The hepatitis B vaccine is typically administered as a series of three doses, with the second and third doses given one month and six months after the first dose, respectively. Full protection against the virus is achieved after completing the series.
It is important to note that while the vaccine is highly effective, no vaccine is 100% effective. Some individuals may not develop adequate protection from the vaccine or may lose protection over time. However, even in cases where the vaccine does not provide complete protection, it can still reduce the severity of illness and the risk of long-term complications.