The weeds provide the necessary habitat for black-fly, mosquitoes and snails, which are the vectors of water-borne illnesses such as bilharzia, river blindness and malaria.
en.wikipedia.org Though not as common, other regularly treated diseases include dracunculiasis, dysentery, river blindness or onchocerciasis, several kinds of pneumonia, dehydration, venereal diseases, and poliomyelitis.
en.wikipedia.org A sophisticated network of storerooms and galleries completed the fortress' defenses and allowed communication between the castle, the town downwards, and the river banks.
en.wikipedia.org River turbulence has created deep pools beneath steep sandstone cliffs on the northeasterly bank.
en.wikipedia.org Even though, the children were seeing gamboling around when our correspondent visited the river, a chat with them showed they were inwardly disturbed.
thenationonlineng.net