<prompt> River blindness is caused by :Drinking river water without boiling.Oncocerca volvulusToxoplasma canisGlaucoma  <response>: Ans. is b i.e. Onchocerca volvulus Onchocerca volvulus is transmitted by Simulium damnosum, a black fly that breeds in areas of rapidly flowing streams thus the term river blindness9Tt by Ivermectin 