Which term best describes strong immune activation with protective memory, often durable immunity?

• A. High immunogenicity
• B. Low immunogenicity
• C. Non-immunogenic
• D. Immunosuppression

Answer: (A)

Strong immune activation that leads to protective memory and durable immunity is described by high immunogenicity. An antigen with high immunogenicity effectively stimulates the immune system to activate B and T cells and to form memory cells and long-lived plasma cells, so re-exposure triggers a rapid, protective response. This is exactly what durable, protective immunity relies on.

In vaccines, maximizing immunogenicity helps ensure lasting protection. Immunogenicity is influenced by the antigen’s properties, the use of adjuvants, the dose and route of delivery, and host factors. By contrast, low immunogenicity means a weak response with poor memory, non-immunogenic means no meaningful immune activation, and immunosuppression refers to a dampened immune system regardless of exposure.