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Question

Identify the correct pair representing the causative agent of typhoid fever and the confirmatory test for typhoid.


A

Plasmodium vivax / UTI test.

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B

Streptococcus pneumoniae / Widal test.

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C

Salmonella typhi / Anthrone test.

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D

Salmonella typhi / Widal test.

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Solution

The correct option is D

Salmonella typhi / Widal test.


The correct option is D.

Explanation for the correct option:

  1. Typhoid is a bacterial infection that is spread through contaminated water. There are numerous typhoid vaccines available.
  2. Salmonella typhi: It is a typhoid causative agent.
  3. It is mostly caused by contaminated food and water.
  4. The Widal test is used to confirm typhoid infection based on the antigen-antibody reaction.

Explanation for the incorrect options:

Option A:

  1. Plasmodium vivax is a parasitic protozoan.
  2. This is widely used in the transmission of malaria.
  3. UTI test: This test is used to perform a urinalysis. It is used to diagnose urinary tract problems.

Option B:

  1. It is a gram-positive bacterium called Streptococcus pneumonia.
  2. It lives in the human respiratory tract as a commensal organism.
  3. The Widal test is used to confirm typhoid infection.

Option C:

  1. Salmonella typhi: It is a typhoid causative agent.
  2. It is primarily caused by contaminated food and water.
  3. Anthrone test: This is the most common test for carbohydrate deficiency.
  4. When carbohydrates react with concentrated sulphuric acid to form furfural, they become dehydrated.

Final answer: Salmonella typhi / Widal test is representing the causative agent of typhoid fever and the confirmatory test for typhoid.


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