River blindness is caused by :
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 blindness9T/t by Ivermectin*
Drinking river water without boiling.
Oncocerca volvulus
Toxoplasma canis
Glaucoma
Ocular Manifestations