Lymphatic filariasis (elephantiasis)

What it is

Lymphatic filariasis is caused by thread-like worms transmitted through repeated mosquito bites. Larvae migrate to the lymphatic system, damaging vessels and causing swelling, pain and recurrent fevers in endemic communities.

Where it occurs

Endemic areas include many parts of Indonesia, India, Bangladesh, sub-Saharan Africa, Haiti and the Pacific islands. Risk rises with long-term residence in affected villages rather than short tourism.

• Rural areas with limited mosquito control
• Coastal and river communities in tropical climates
• Regions where mass drug administration programmes operate

Relation to the eyes

Eye complications are not the main feature of lymphatic filariasis. Very rarely, inflammation near facial lymphatics can cause eyelid swelling during acute episodes. The main eye-health link is programmatic: WHO integrates filariasis elimination with other neglected tropical disease work that prevents blindness.

WHO prevention

Mass drug administration with medicines such as albendazole combined with ivermectin or diethylcarbamazine, repeated annually in endemic districts, clears larvae and stops transmission. Mosquito nets and bite prevention support elimination goals.