Question

Identify A and B.

(i) Tetanus Toxoid
(ii) Anti-tetanus serum
(iii) Diphtheria, pertussis, and tetanus vaccine
(iv) Antitoxin diphtheria serum
(v) Bacillus Calmette–Guérin (BCG) vaccine

• A.

  A	B
  (i), (iii), (iv)	(ii), (v)

• B.

  A	B
  (i), (ii), (v)	(iii), (iv)

• C.

  A	B
  (ii), (iii), (v)	(i), (iv)

• D.

  A	B
  (i), (iii), (v)	(ii), (iv)

Answer 1

Answer: (D)

Active immunity: 1. Immunity is said to be active when person’s own cells produce antibodies in response to infection or vaccination. 2. It takes time in the formation of antibodies. 3. It is harmless. 4. Active immunity is long-lasting.
Example: Vaccines and toxoids injected in a person.
Passive immunity:
1. Immunity is said to be passive when antibodies produced in other organism are injected into a person to counteract antigen such as snake venom. 2. It provides immediate relief. 3. It may create problems. Foreign antibodies may cause reactions and the body may destroy them by forming its own antibodies. 4. Passive immunity is not long-lasting.
Example: Preformed antibodies like anti-tetanus serum injected in body.