Acquired active immunity results from which process?

Acquired active immunity results from which process?

• A. Vaccination
• B. Antitoxin administration
• C. Ingestion of colostrum
• D. Administration of gamma globulin

Answer: (A)

Active immunity develops when the body's immune system is stimulated to produce its own antibodies and memory cells in response to an antigen. Vaccination does exactly this by introducing a safe form of the pathogen (or part of it) that prompts the immune system to respond, generating B and T cell responses and leaving behind memory for quick, stronger protection if encounter occurs again. The other options provide antibodies from outside the body (passive immunity) and don’t create lasting immunologic memory. Antitoxin administration delivers specific antibodies against a toxin; colostrum provides maternal antibodies; gamma globulin supplies preformed antibodies. These offer immediate protection but are not sustained because the body doesn’t mount its own long-term response.

Active immunity develops when the body's immune system is stimulated to produce its own antibodies and memory cells in response to an antigen. Vaccination does exactly this by introducing a safe form of the pathogen (or part of it) that prompts the immune system to respond, generating B and T cell responses and leaving behind memory for quick, stronger protection if encounter occurs again.

The other options provide antibodies from outside the body (passive immunity) and don’t create lasting immunologic memory. Antitoxin administration delivers specific antibodies against a toxin; colostrum provides maternal antibodies; gamma globulin supplies preformed antibodies. These offer immediate protection but are not sustained because the body doesn’t mount its own long-term response.