**Question:** Following are Arboviral diseases -

A. Dengue
B. Yellow fever
C. West Nile fever
D. Chikungunya

**Correct Answer:** D. Chikungunya

**Core Concept:** Arboviral diseases are a group of vector-borne viral infections transmitted to humans through the bite of infected arthropod vectors, primarily mosquitoes and ticks. These diseases are named after the local word for "joint disease," as many patients exhibit severe arthralgia (painful joint inflammation) as a prominent symptom.

**Why the Correct Answer is Right:** Chikungunha virus is the causative agent of Chikungunha fever. It is transmitted to humans through the bite of infected Aedes aegypti and Aedes albopictus mosquitoes. The virus replicates in the mosquito vector, then is transmitted to humans upon mosquito bite, causing the disease.

**Why Each Wrong Option is Incorrect:**

A. Dengue: Dengue virus is transmitted through the bite of Aedes mosquitoes (Aedes aegypti and Aedes albopictus) and causes dengue fever. Dengue is not the correct answer as Chikungunha fever is the correct choice.
B. Yellow fever: Yellow fever is caused by the Yellow fever virus and transmitted through the bite of Haemagogus mosquitoes and Aedes mosquitoes. The correct answer is Chikungunha fever.
C. West Nile fever: West Nile fever is caused by the West Nile virus transmitted through the bite of Culex mosquitoes. The correct answer is Chikungunha fever.

**Clinical Pearl:** Arboviral diseases are a significant global health concern due to their rapid spreading, high morbidity, and potential for outbreaks. Early recognition of the clinical presentation and vector involved can aid in proper infection control measures and patient management.