Inactivated vaccines typically rely on which component to enhance the immune response?

• A. Aluminum salts
• B. Adjuvants
• C. Mercury
• D. Lipids

Answer: (B)

Adjuvants are substances added to vaccines to boost the immune response, especially when the antigen is less immunogenic on its own, as with inactivated vaccines. They work by activating innate immune pathways and helping antigen-presenting cells take up and present the vaccine antigen more effectively, which enhances both antibody production and T-cell activation. This is why adjuvants are used to amplify the response to inactivated vaccines. Aluminum salts are a common type of adjuvant, illustrating how this component supports immunity, while mercury is not used to enhance immune response in vaccines, and lipids are not the general mechanism by which inactivated vaccines are boosted.