alleryThe Widal test is used to diagnose which disease?
ATyphoid
BMalaria
CCommon cold
DAIDS
Answer & Solution
Correct answer: A. Typhoid
1. The Widal test detects antibodies against Salmonella antigens.
2. Positive Widal indicates typhoid infection.
3. Your syllabus mentions the historic case of Mary Mallon ("Typhoid Mary"), a chronic carrier.
4. Malaria diagnosis relies on blood smear microscopy; AIDS on antibody testing.
_Source: syllabus Biology, Ch 7 "Human Health and Disease", §7.1_
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