Which of the following diseases could be exclusively associated with a river basin?
Explanation: Onconcerciasis is a disease carried by the vector called black fly known to be found around fast flowing river basin area. Whenever swimmers come to swim they get bitten by the fly and the organism onchocercia get into the blood stream of the secondary hos and the disease results. Syphylis, Malaria and Cholera are not associated with fast flowing river. Syphilis is a sexually transmitted disease transmitted through sexual inter course. Malaria is transmitted when infected female anopheles mosquito introduce the protozoan, plastmodium into their secondary hosts. Cholera results when humans feed on poisoned food and watwhen flies carrying the bacteria vibrio cholerae come in contact with the food and the water