What is the purpose of vaccination in infection control?

• A. To stimulate adaptive immunity and provide protection against specific pathogens
• B. To stimulate innate immunity and provide nonspecific protection
• C. To eliminate all bacteria from the body
• D. To stimulate adaptive immunity and provide protection against specific pathogens

Answer: (D)

Vaccination works by training the adaptive immune system to recognize and remember specific pathogens. By presenting harmless forms or components of a pathogen, vaccines trigger B cells to produce antibodies and create memory B and T cells. If the real pathogen is encountered later, these memory cells enable a fast, targeted immune response that prevents illness or reduces its severity. This is protection that is specific to the particular pathogen the vaccine targets, unlike innate immunity, which is nonspecific. Vaccines do not aim to eliminate all bacteria from the body, but to prevent disease caused by specific organisms.