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Q25 (CDS-I/2024) Science & Technology › Biotechnology & Health › Vaccines and immunization Answer Verified

Which of the following statements is/are correct about vaccination that provides protection against an infectious disease? 1. It blocks the entry of the infectious agent into body. 2. It produces antibodies against infection. 3. It kills the infectious agent when it enters in the body.

Result
Your answer: —  Â·  Correct: B
Explanation

Vaccination is the administration of a vaccine to help the immune system develop protection against a specific disease.

  • Statement 1 is incorrect: Vaccines do not create a physical shield to block the entry of pathogens. The infectious agent can still enter the body, but the immune system acts quickly to neutralize it.
  • Statement 2 is correct: A vaccine works by introducing a weakened, harmless, or inactive part of the pathogen. This stimulates the body's immune system to produce specific antibodies and memory cells against the infection.
  • Statement 3 is incorrect: The vaccine itself does not directly kill the infectious agent. Instead, it prepares and trains the body's own immune system (such as white blood cells) to recognize and destroy the pathogen upon future exposure.

Therefore, only statement 2 is correct.

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