Filariasis
（重定向自Filarial infection）
![](/Images/godic/202501/13/Filariasis_013050.png")
Filariasis (or philariasis) is a parasitic disease caused by an infection with roundworms of the Filarioidea type. These are spread by blood-feeding black flies and mosquitoes. This disease belongs to the group of diseases called helminthiasis.
Eight known filarial nematodes use humans as their definitive hosts. These are divided into three groups according to the niche within the body they occupy: