Age Factors Animals Anthelmintics--therapeutic use Arthropods Climate Disability Evaluation Disease Reservoirs Disease Vectors Dracunculiasis--diagnosis Dracunculus Nematode--anatomy & histology Ecology Female Gastric Juice History, 17th Century History, 18th Century History, 19th Century History, 20th Century History, Ancient History, Medieval Injections, Intraperitoneal Larva--growth & development Male Metamorphosis, Biological Microscopy, Electron Seasons