True about yellow fevera) I.P. is 10-14 daysb) Transmittd by Aedesc) It is found in Asiad) Incidence is increased by humiditye) It is a flavivirus
**Core Concept**
Yellow fever is a viral hemorrhagic disease caused by a flavivirus, transmitted primarily through the bite of an infected Aedes mosquito. It is endemic in certain regions of Africa and South America, with a significant impact on public health.
**Why the Correct Answer is Right**
The correct answer is that yellow fever is a flavivirus. Flaviviruses are a group of viruses that also include other notable pathogens like dengue fever, Zika virus, and West Nile virus. Yellow fever virus is transmitted through the bite of an infected Aedes mosquito, which is the primary vector for this disease. The virus replicates in the mosquito's gut and saliva before being transmitted to humans through a bite.
**Why Each Wrong Option is Incorrect**
* **Option A:** The incubation period (I.P.) of yellow fever is typically 3-6 days, not 10-14 days.
* **Option B:** Yellow fever is transmitted by the bite of an infected Aedes mosquito, but it is not exclusively transmitted by Aedes.
* **Option C:** Yellow fever is primarily found in Africa and South America, but it is not typically found in Asia.
* **Option D:** The incidence of yellow fever is not increased by humidity; rather, it is influenced by factors such as rainfall, temperature, and the presence of Aedes mosquito breeding sites.
**Clinical Pearl / High-Yield Fact**
It's essential to note that yellow fever is a vaccine-preventable disease, and vaccination is recommended for travelers to endemic areas. However, the vaccine is not 100% effective, and other control measures like mosquito avoidance and vector control are crucial in preventing the spread of the disease.
**Correct Answer: e. It is a flavivirus**