alleryTyphoid fever in humans is caused by:
AEntamoeba histolytica
BSalmonella typhi
CPlasmodium vivax
DStreptococcus pneumoniae
Answer & Solution
Correct answer: B. Salmonella typhi
**Typhoid** is caused by **Salmonella typhi** — enters small intestine via contaminated food/water, migrates via blood.
**Symptoms:** sustained 39–40°C fever, weakness, stomach pain, constipation.
Confirmed by **Widal test**.
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