- 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.