Low immunogenicity is often associated with what type of infection?

• A. Chronic or persistent infection
• B. Acute, self-limiting infection
• C. Vector-borne infection
• D. Neonatal infection

Answer: (A)

Immunogenicity is about how strongly a pathogen stimulates the immune system. In chronic or persistent infections, the pathogen often employs ways to avoid or dampen the immune response, allowing it to linger. It may keep antigen levels low, hide inside cells, or produce factors that interfere with antigen presentation and immune activation. This ongoing but subdued immune engagement leads to a situation where the infection persists with relatively weak, non-clearing immune responses, i.e., low immunogenicity. Think of infections like hepatitis B or C, HIV, or herpesviruses, where the pathogen remains in the host for a long time without provoking a strong, complete clearance.

Acute, self-limiting infections usually provoke a vigorous immune response that clears the pathogen quickly, so they are typically more immunogenic. Vector-borne describes transmission route, not immune strength, and neonatal infections involve immature or differently regulated immune systems, which doesn’t inherently define low immunogenicity across infections.