Microbiology Parasitology ee7b2ef8 River blindness is caused by: A Onchocerca B Loa Loa C Ascaris D B. malayi High-Yield Explanation Ans. is 'a' i.e., Onchocerca(Ref: Harrison, 19th/e, p. 1421)* Onchocerciasis is also known as River blindness Q and fly involved is Simulium fly.