Brugia malayi is a parasitic worm that causes lymphatic filariasis, a disease affecting the lymphatic system in humans. It is primarily transmitted through the bites of infected mosquitoes, particularly those from the Anopheles and Aedes genera. The adult worms reside in the lymphatic vessels, leading to inflammation and swelling. This parasite is mainly found in tropical and subtropical regions of Asia, including countries like India, Indonesia, and Malaysia. Infection can result in severe complications, such as lymphedema and hydrocele, which can significantly impact a person's quality of life. Preventive measures include mosquito control and the use of protective clothing.