2024 · Q89
Which of the following statements is/are correct about vaccination that provides protection against an infectious disease?
- 1It blocks the entry of the infectious agent into body.
- 2It produces antibodies against infection.
- 3It kills the infectious agent when it enters in the body.
Select the correct answer using the code given below.
General KnowledgeBiology
- A1 only
- B2 only
- C2 and 3 only
- D1, 2 and 3
Explanation
Statement 2 is the correct description: vaccination stimulates the immune system to produce antibodies (and memory cells) against the infectious agent. Statement 1 is incorrect: vaccines do not physically block the entry of the agent into the body. Statement 3 is incorrect: vaccines do not directly kill the infectious agent on entry; they prime the immune system to neutralise it. Only statement 2 is correct, so the answer is (B).