Brugia are roundworms that cause lymphatic filariasis in humans. Specifically, B. malayi and B. timori infect humans in Asia and Africa, causing symptoms like lymphadenitis, lymphangitis, and lymphedema. They have a two-host life cycle, using mosquitos to transmit between hosts. Diagnosis involves blood smears and tests to detect microfilariae, with treatment primarily using diethylcarbamazine or doxycycline.