A patient bitten by a venomous snake is injected with antiserum containing ready made antibodies. This provides
- A. active immunity lasting many years
- B. a vaccination effect
- C. immediate but temporary passive immunity
- D. permanent genetic resistance
Explanation
Borrowed antibodies neutralise the venom at once but are gradually broken down over weeks, giving no memory. In an emergency that speed is worth more than durability, which is exactly why antiserum is used.