**Question:** Which of the following is/are arboviral diseases?

A. Dengue fever
B. Yellow fever
C. Zika virus infection
D. Chikungunya virus infection

**Core Concept:** Arboviral diseases are a group of infectious diseases caused by viruses transmitted to humans and animals through the bite of an infected arthropod vector, such as mosquitoes, ticks, or fleas. Arboviruses are found worldwide and can cause a wide range of symptoms depending on the virus and the host's immune response.

**Core Concept Explanation:** Arboviral diseases are caused by viruses transmitted to humans through the bite of infected arthropod vectors. Arthropods, such as mosquitoes, ticks, and fleas, act as vectors by carrying the virus within their bodies without showing symptoms and then transmitting the virus to humans when they bite. Arboviruses can infect various organs and tissues, leading to a wide range of symptoms, including fever, rash, headache, muscle aches, joint pain, and gastrointestinal symptoms. The severity of the disease depends on the virus and the host's immune response.

**Why the Correct Answer is Right:**

1. Dengue fever (A) is caused by the Dengue virus and transmitted by the Aedes mosquito. It can lead to severe complications like dengue hemorrhagic fever and dengue shock syndrome.
2. Yellow fever (B) is caused by the Yellow fever virus and transmitted by the Haemagogus mosquito in tropical Africa and South America.
3. Zika virus infection (C) is caused by the Zika virus and transmitted by the Aedes mosquito, leading to symptoms such as fever, rash, and conjunctivitis. The virus is also associated with microcephaly and Guillain-Barré syndrome in pregnant women and newborns.
4. Chikungunya virus infection (D) is caused by the Chikungunya virus and transmitted by the Aedes mosquito. Symptoms include fever, joint pain, headache, and rash.

**Why Each Wrong Option is Incorrect:**

1. Option A (Dengue fever) is correct as it is caused by the Dengue virus and transmitted by the Aedes mosquito.
2. Option B (Yellow fever) is incorrect as it is caused by the Yellow fever virus and transmitted by the Haemagogus mosquito, not Aedes.
3. Option C (Zika virus infection) is correct as it is caused by the Zika virus and transmitted by the Aedes mosquito, leading to symptoms like fever, rash, and conjunctivitis. The virus is also associated with microcephaly, Guillain-Barré syndrome in pregnant women and newborns.
4. Option D (Chikungunya virus infection) is correct as it is caused by the Chikungunya virus and transmitted by the Aedes mosquito, leading to symptoms like fever, joint pain, headache, and rash.

**Clinical Pearls:**

1. Arboviral diseases, such