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NOTE: CDC's DPDx webpage for Laboratory Identification of Parasites of Public Health Concern has been moved to https://www.cdc.gov/dpdx/index.html. See the Parasites A-Z Index to locate diagnostics for a parasite.
The US Center for Disease Control offers complete information about this disease (also called elephantiasis) spread by Simulium blackflies, mainly in Africa: life cycle, epidemiology, disease, treatment, prevention, etc