Artificially acquired passive immunity is exemplified by?

• A. Transfer of antibodies from another source.
• B. Host's own production of antibodies after exposure.
• C. Activation of T cells to destroy infected cells.
• D. Vaccination with a live attenuated pathogen.

Answer: (A)

Artificially acquired passive immunity is when you obtain antibodies from another source through medical treatment, such as immunoglobulin injections or antivenoms. It provides immediate protection because the antibodies are already present, but the protection is temporary since the recipient’s immune system isn’t making those antibodies or forming memory.

This differs from the host’s own production of antibodies after exposure, which is active immunity and takes time to develop but creates memory for longer-lasting protection. Activation of T cells to destroy infected cells describes cellular immunity, not antibody transfer. Vaccination with a live attenuated pathogen triggers active immunity by prompting the host to produce its own antibodies and memory cells.