Streptocerciasisis an infectious disease caused by Mansonella streptocerca.


Causes

Mansonia streptocerca adults are filamentous. The males are 13.3mm long, and the females are 19 - 25mm long. Adults mainly live in the subcutaneous tissues of the human body. Microfilariae do not appear in the blood, but appear in the collagen fibers of the skin, mostly in the shoulders, followed by the trunk and extremities. Midges are the transmission vector of the disease. After being inhaled by the midges, the microfilariae develop into infective larvae in 7 - 8 days. When midges containing infective larvae bite humans, the larvae can invade the human body.


Signs and Symptoms

The most common symptoms are hypopigmentation and pruritus on the skin. There may be elephantiasis, chronic prurigo, severe dermatitis, and cutaneous edema. The rash is more common on the shoulders and trunk.


Diagnosis

The diagnosis of this disease mainly relies on the detection of microfilariae or adult worms from the skin.


Treatment

The medication is oral diethylcarbamazine or ivermectin.