**Question:** Dengue fever, all true except:

A. Dengue fever is caused by the bite of an infected mosquito.
B. Dengue fever is a rare disease in temperate climates.
C. Dengue fever is a zoonotic disease, transmitted by the bite of infected rodents.
D. Dengue fever has a high mortality rate in children.

**Correct Answer:** C. Dengue fever is a zoonotic disease, transmitted by the bite of infected rodents.

**Core Concept:** Dengue fever is an infectious disease caused by the dengue virus, transmitted through the bite of infected Aedes mosquitoes. It is prevalent in tropical and subtropical regions, particularly in Asia and the Pacific. The disease is named after the "dengue" sound in the Hindi word "dengue," which means "splitting headache."

**Why the Correct Answer is Right:** Dengue fever is not caused by rodents, but rather by the Aedes mosquito. Aedes mosquitoes are known for transmitting arboviral diseases, including dengue fever. In contrast, the disease is transmitted through the bite of infected mosquitoes, not rodents.

**Why Each Wrong Option is Incorrect:**

A. This option is correct as dengue fever is indeed caused by the bite of an infected mosquito.
B. Dengue fever is not a rare disease in temperate climates, as it can occur in tropical and subtropical regions worldwide. The statement is incorrect, as the disease is more prevalent in these areas due to suitable environmental conditions for Aedes mosquitoes.
D. Dengue fever has a low mortality rate, especially when appropriately treated and managed. This option is incorrect, as the disease can lead to severe complications and potentially fatal outcomes, particularly in children.

**Clinical Pearl:** Dengue fever is essential knowledge for physicians and medical students, particularly those practicing in endemic regions. Understanding the disease's transmission, symptoms, and management is crucial for providing appropriate care to patients.