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Filariasis is a disease caused by a chronic mosquito-borne parasitic infection. Chronic infection can lead to swelling of the extremities, hydroceles, and testicular masses. It is the second-largest cause of permanent deformity and disability behind leprosy worldwide. Infection caused by parasites classified as nematodes: Lymphatic filariasis is caused by infection with parasites classified as nematodes (roundworms) of the family Filariodidea. There are 3 types of these thread-like filarial worms: Wuchereria bancrofti, which is responsible for 90% of the cases. Detected by examining thick smears: Filariasis circulating microfilariae can be detected by examining thick smears (20–60 μl) of finger-prick blood. Blood must be collected at a specific time – either at night or during the day – depending on the periodicity of the microfilariae. Signs and symptoms : Fever. Inguinal or axillary lymphadenopathy. Testicular and/or inguinal pain. Skin exfoliation. Limb or genital swelling - Repea