The **Widal test** is used for diagnosis of:
AMalaria
BTyphoid (caused by *Salmonella typhi*)
CTuberculosis
DAIDS
Answer & Solution
Correct answer: B. Typhoid (caused by *Salmonella typhi*)
Widal test: detects agglutinating antibodies (anti-O, anti-H) against *Salmonella typhi*/*paratyphi* antigens in patient serum. Useful 7-10 days after symptom onset. Modern alternative: blood culture, IgM ELISA.
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