Wuchereria bancrofti is a parasitic worm that causes lymphatic filariasis, a disease affecting the lymphatic system. It is transmitted to humans through the bites of infected mosquitoes, primarily Culex species. The adult worms live in the lymphatic vessels, leading to inflammation and swelling, particularly in the legs and genitals. Infection with Wuchereria bancrofti can result in severe complications, including lymphedema and hydrocele. The disease is prevalent in tropical and subtropical regions, impacting millions of people worldwide. Preventive measures include mosquito control and the use of medications to reduce transmission and manage symptoms.