**Scrub Typhus Overview**
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**Core Concept**
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Scrub typhus is a vector-borne disease caused by the bacterium *Orientia tsutsugamushi*, transmitted through the bite of infected chiggers (larval mites). The disease is characterized by fever, headache, and rash, and can lead to serious complications if left untreated.

**Why the Correct Answer is Right**
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Scrub typhus is caused by *Orientia tsutsugamushi*, which is a small, gram-negative bacterium. The bacteria are transmitted to humans through the bite of infected chiggers, which ingest the bacteria while feeding on the blood of infected rodents. The bacteria multiply within the chiggers and are then transmitted to humans through the chigger's saliva during feeding. The disease is characterized by a distinctive eschar at the site of the chigger bite, followed by fever, headache, and rash.

**Why Each Wrong Option is Incorrect**
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* **Option A:** This option is incorrect because scrub typhus is not transmitted through the bite of infected mosquitoes. While mosquitoes can transmit other diseases such as dengue fever and malaria, scrub typhus is specifically transmitted through the bite of infected chiggers.
* **Option B:** This option is incorrect because scrub typhus is not caused by a virus. The disease is caused by the bacterium *Orientia tsutsugamushi*, which is a small, gram-negative bacterium.
* **Option C:** This option is incorrect because scrub typhus is not transmitted through contaminated food or water. The disease is transmitted through the bite of infected chiggers, not through contact with contaminated substances.

**Clinical Pearl / High-Yield Fact**
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A key feature of scrub typhus is the presence of a distinctive eschar at the site of the chigger bite. This eschar is a characteristic sign of the disease and can be used to aid in diagnosis.

**Correct Answer: C.**