The epidemiology of Echinococcus infection in the Niger Delta.
D000818:Animals; D002417:Cattle; D003430:Cross-Sectional Studies; D004283:Dog Diseases / Q000453:epidemiology*; D004285:Dogs; D004443:Echinococcosis / Q000453:epidemiology / Q000662:veterinary*; D006041:Goats; D008460:Meat; D009548:Niger; D012756:Sheep