Explain why the hepatitis b vaccine is administered multiple times over the course of a child’s life. what does it mean when doctors use the term “booster shot”?

Hepatitis B vaccine is created through the use of dead Hep B pathogens and / or pieces of the Hep B pathogen. This is a way to ensure the recipient does not contract the disease, but it is also not as effective a way for the body to provide 'recognition' of the pathogen. Administering it in three doses helps the development of the memory B lymphocyte cells and ensures immunity against the disease.