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Which of the following tests is an agglutination test for the bacterium causing typhoid fever?

Q. Which of the following tests is an agglutination test for the bacterium causing typhoid fever?

A. API 20E system

B. Widal test

C. Quellung reaction

D. IMViC

The agglutination test that used for identifying the bacterium causing typhoid fever is?

Answer:  B (Widal test).

Explanation: The causative agent of typhoid fever is Salmonella enterica, a gram-negative bacteria.

In general, S. enterica contains O antigen on its cell wall and H antigen on its flagella. Upon infection, these bacterial antigens stimulate the production of specific antibodies in the infected person’s blood.

Widal test is an indirect agglutination (antigen-antibody interactions) test used for typhoid fever, in which bacterial antigens-stimulated specific antibodies will be detected using Widal test antigens.

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