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What is the Widal test used to diagnose?

  • A Malaria
  • B Typhoid fever
  • C Dengue
  • D Tuberculosis

Correct answer: B. Typhoid fever

Explanation: The Widal test detects antibodies against Salmonella typhi antigens (O and H antigens) in patient's serum. It is a diagnostic test for typhoid fever. A rising titre (4x increase) over two tests is diagnostic.

Concept context

Pathogens, infectious diseases, non-infectious diseases, drugs, cancer, and public health. High NEET importance.

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