The tick-borne hemorrhagic fever found in Karnataka state is
**Core Concept**
The question is testing the student's knowledge of tick-borne hemorrhagic fevers, specifically the one endemic to Karnataka state in India. **Kyasanur Forest Disease (KFD)** is a viral hemorrhagic fever caused by a tick-borne virus, transmitted through the bite of an infected tick.
**Why the Correct Answer is Right**
KFD is a viral disease characterized by fever, headache, and hemorrhaging. The virus is transmitted through the bite of an infected tick, specifically the _Haemaphysalis spinigera_ tick. The virus replicates in the tick's salivary glands and is transmitted to humans through the tick's saliva during feeding. **The incubation period of KFD is typically 3-8 days**, and the disease can range from mild to severe, with symptoms including fever, headache, and hemorrhaging.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it is not a tick-borne disease. **Dengue fever**, caused by the dengue virus, is transmitted through the bite of an infected mosquito, not a tick.
* **Option B:** This option is incorrect because **Crimean-Congo Hemorrhagic Fever (CCHF)** is a tick-borne disease, but it is not endemic to Karnataka state in India. CCHF is found in Africa, Asia, and Eastern Europe.
* **Option D:** This option is incorrect because **Hemorrhagic Fever with Renal Syndrome (HFRS)** is a viral disease, but it is not tick-borne. HFRS is caused by viruses in the _Hantavirus_ genus and is transmitted through contact with infected rodents or their droppings.
**Clinical Pearl / High-Yield Fact**
KFD is a zoonotic disease, meaning it can be transmitted from animals to humans, and is primarily found in the forest areas of Karnataka state in India. **The disease is often associated with outdoor activities such as hiking and farming**.
**Correct Answer: C. Kyasanur Forest Disease (KFD)**