Family Filariidae refers to a group of parasitic roundworms that infect humans and animals. Commonly known as "threadworms," members of this family can cause a variety of illnesses, including filariasis and Onchocerciasis or river blindness. Other synonyms for the family Filariidae include filaria, filarial worm, and filarial nematode. These parasitic worms are transmitted through the bites of infected insects, such as mosquitoes, and can cause significant harm to their hosts if left untreated. While there are effective treatments for filariasis, prevention remains the best strategy for controlling the spread of these parasites.