Lymphatic filariasis is one of the world’s leading causes of permanent and long-term disability. It damages the human lymphatic system, leading to disfiguring swelling of limbs, breasts and genitals. Despite a decade of World Health Organisation led drug administration to halt its spread, the disease is endemic in 72 countries, puts about 1.4 billion at risk and affects about 120 million people. People are primarily infected with the disease through mosquito bites. In Africa, the Anopheles mosquito is the main vector. The female Anopheles mosquito transmits microscopic filarial parasitic worms from one person to another during its feeding process. These worms then live and grow in the human lymphatic system, causing disruption and damage. Why Is It So Hard to End Elephantiasis?