Break bone fever is caused by:
**Core Concept**
Break bone fever is a colloquial term for a severe form of dengue fever, a mosquito-borne viral disease caused by an infection with any of the four dengue virus serotypes. It is characterized by high fever, severe headache, pain behind the eyes, joint and muscle pain, rash, and mild bleeding.
**Why the Correct Answer is Right**
The correct answer is related to the pathogenesis of dengue fever. Dengue virus infects mononuclear phagocytes, such as dendritic cells and macrophages, leading to the release of pro-inflammatory cytokines and the activation of the coagulation cascade. This results in the characteristic symptoms of dengue fever, including fever, headache, and pain.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because malaria is caused by Plasmodium species, not a viral infection.
**Option B:** This option is incorrect because typhoid fever is caused by Salmonella Typhi, not a viral infection.
**Option C:** This option is incorrect because Zika virus is a different mosquito-borne virus that causes a different set of symptoms, including birth defects.
**Clinical Pearl / High-Yield Fact**
Dengue fever is a significant public health concern in tropical and subtropical regions, with an estimated 390 million cases worldwide each year. It can be prevented by avoiding mosquito bites, using insecticides, and maintaining good hygiene.
**Correct Answer:** C.