Causes

The disease is caused in huge numbers in tropical countries where there is vegetation and high density.

The disease is prevalent in Kenya 

The carriers of the infection are the black flies in areas where there is rich combination of agricultural soil and water bodies.

In lesser developed areas of the world, especially the remote places, are the biggest victims of this dangerous disease.

Symptoms include severe itching, disfiguring skin conditions, and visual impairment, including permanent blindness.