Niger is recognised as the fifth country in the world, and the first in Africa, to have successfully halted the transmission of the parasite Onchocerca volvulus. The other four countries that have ...

in eliminating onchocerciasis-- also known as 'river blindness' -- a parasitic disease caused by a 'filarial' worm 'Onchocerca volvulus'. It is understood to be transmitted by the repeated bites ...