Typhoid fever is caused by which pathogen?
A{'text': 'Salmonella typhi', 'label': 'A'}
B{'text': 'Streptococcus pneumoniae', 'label': 'B'}
C{'text': 'Plasmodium vivax', 'label': 'C'}
D{'text': 'Rhinovirus', 'label': 'D'}
Answer & Solution
Correct answer: A. {'text': 'Salmonella typhi', 'label': 'A'}
1. NCERT names Salmonella typhi as the causative agent of typhoid.
2. The bacterium enters through contaminated food or water and reaches the small intestine.
3. Confirmed by the Widal test.
4. Symptoms include sustained high fever (39-40°C), weakness, headache and loss of appetite.
_Source: NCERT Class 12 Biology, Ch 7 "Human Health and Disease", §7.1_
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