Question

What is passive immunity and how does it differ from active immunity in terms of duration?

Options

• Passive immunity is obtained by direct transfer of ready-made antibodies and is short-lived because memory cells are not formed, unlike active immunity which is long-lasting

• Passive immunity is produced by the body's own immune system and lasts longer than active immunity

• Passive immunity lasts longer than active immunity because antibodies are transferred directly

• Passive immunity and active immunity have the same duration of protection

Answer 1

Passive immunity occurs when ready-made antibodies are given to a person rather than being produced by their own immune system. It provides immediate protection but is short-lived because memory cells are not formed. Active immunity, conversely, is usually long-lasting due to the formation of memory cells.