Passive immunity example?

Passive immunity example?

• A. Antibodies produced by the individual's own immune system
• B. Antibodies transferred through placenta or breast milk
• C. Active immunity after infection
• D. Cell-mediated immunity

Answer: (B)

Passive immunity occurs when antibodies are given to a person rather than produced by their own immune system. This provides immediate protection but is temporary because no memory is established. A classic example is antibodies transferred from mother to fetus through the placenta or from mother to infant via breast milk, which can shield the newborn early in life. In contrast, active immunity involves the individual making antibodies and memory cells after infection or vaccination, leading to longer-lasting protection. The other options describe active immune processes or T-cell–mediated responses rather than passive antibody transfer.

Passive immunity occurs when antibodies are given to a person rather than produced by their own immune system. This provides immediate protection but is temporary because no memory is established. A classic example is antibodies transferred from mother to fetus through the placenta or from mother to infant via breast milk, which can shield the newborn early in life. In contrast, active immunity involves the individual making antibodies and memory cells after infection or vaccination, leading to longer-lasting protection. The other options describe active immune processes or T-cell–mediated responses rather than passive antibody transfer.