Which type of immune response is provided from booster vaccines?

Booster vaccines are designed to enhance the immune response that has already been initiated by a primary vaccination. When an initial vaccine is administered, the body generates a primary immune response, which involves the activation of B and T lymphocytes that produce antibodies and memory cells specific to the pathogens targeted by the vaccine. However, this response may diminish over time.

A booster vaccine is given to remind the immune system about the pathogen, leading to a more robust and quicker response. This subsequent response, known as the secondary immune response, is characterized by a more rapid and heightened production of antibodies due to the memory cells that were generated during the primary response. Memory cells "remember" the pathogen and respond more vigorously upon re-exposure, which is the essence of why the secondary immune response is stronger and more effective in providing immunity.

In summary, booster vaccines trigger the secondary immune response by reintroducing the antigen, allowing for an enhanced and accelerated immune reaction compared to the initial exposure.