what is the purpose of booster shots? quizlet
In medical terms, a booster dose is an extra administration of a vaccine after an earlier dose. After initial immunization, a booster injection or booster dose is a re-exposure to the immunizing antigen. It is intended to increase immunity against that antigen back to protective levels, after memory against that antigen has declined through time. For example, tetanus shot boosters are often recommended every 10 years, after which memory cells specific against tetanus have lost their function or