Which describes passive artificial immunity?

Which describes passive artificial immunity?

• A. Transfer of antibodies through placenta
• B. Vaccination
• C. Injection of immune serum
• D. Infection

Answer: (C)

Passive artificial immunity means giving someone ready-made antibodies from another source, providing immediate protection without the body having to produce its own response. The injection of immune serum fits this perfectly because it delivers preformed antibodies directly to the recipient, offering rapid defense that starts right away and doesn’t create lasting memory. This differs from natural passive immunity, such as the transfer of antibodies through the placenta, which occurs naturally during pregnancy. It also differs from active approaches: vaccination introduces an antigen to stimulate the body's own immune system to produce antibodies and memory, while infection prompts the body to mount its own immune response, resulting in active immunity with lasting memory.

Passive artificial immunity means giving someone ready-made antibodies from another source, providing immediate protection without the body having to produce its own response. The injection of immune serum fits this perfectly because it delivers preformed antibodies directly to the recipient, offering rapid defense that starts right away and doesn’t create lasting memory.

This differs from natural passive immunity, such as the transfer of antibodies through the placenta, which occurs naturally during pregnancy. It also differs from active approaches: vaccination introduces an antigen to stimulate the body's own immune system to produce antibodies and memory, while infection prompts the body to mount its own immune response, resulting in active immunity with lasting memory.