What is lymphatic filariasis?

Lymphatic filariasis is a leading cause of physical disability. It is often characterised by the abnormal enlargement of body parts.

Hassana from Nigeria sits in her home. She has lymphatic filariasis and her left leg is visibly swollen.

Lymphatic filariasis is transmitted via mosquito bite, usually during childhood, and affects the lymphatic system in later life, causing painful disability and disfigurement.

It is one of a group of conditions known as neglected tropical diseases (NTDs). Once a person is infected, adult worms lodge in the body’s lymphatic vessels, affecting the lymphatic system. The worms can live for six to eight years, producing millions of larvae that circulate in the infected person’s blood.

The debilitating symptoms mean many people are unable to work, and children miss school to care for family members. The associated stigma can have a devastating impact on those affected, as well as their families and communities.

Watch our video to learn more about Sightsavers’ work to treat lymphatic filariasis in Guinea-Bissau.

120 million
people worldwide are infected with LF
40 million
people are incapacitated by the disease
885 million
people are currently at risk of LF

How is lymphatic filariasis treated?

A girl in Kenya receives her medication to protect against river blindness and lymphatic filariasis.


A combined dose of two medicines is given every year to people in high-risk areas by local volunteer community-directed distributors.

Ibrahim Hassan from Nigeria, who suffers from lymphatic filariasis.

Medical care

Although people suffering from advanced lymphatic filariasis cannot be cured, the symptoms can be eased through surgery and care.

A woman working in a science laboratory.


Research is undertaken to inform, improve and evaluate our strategies, helping to eliminate this disease faster and equitably.

What we’re doing

Sightsavers is fighting hard to eliminate lymphatic filariasis in the countries in which we work by 2020.

While river blindness is transmitted by the black fly and lymphatic filariasis by the mosquito, both diseases are caused by an infection of a filarial worm and often occur in the same places. Where they are co-endemic, Sightsavers coordinates treatments for these two diseases using Mectizan® tablets, donated by pharmaceutical company Merck Sharpe & Dohme (MSD), and albendazole tablets, donated by GlaxoSmithKline.

In countries where river blindness in not co-endemic, lymphatic filariasis is treated using diethylcarbamazine, produced by Eisai, and albendazole tablets, donated by GlaxoSmithKline.

In 2018, we provided more than 45 million treatments for LF worldwide. We also trained more than 218,000 local volunteers to distribute medication to treat a range of neglected tropical diseases, including lymphatic filariasis.

Although people suffering from advanced LF cannot be cured, the symptoms can be eased through surgery and care. Sightsavers works with WASH (water, sanitation and hygiene) organisations to help households access clean water and facilities, so people can clean their affected limbs and care for their skin with clean water and soap. Symptoms can also be helped by elevating limbs and by wearing footwear.

District onchocerciasis co-ordinator William Mugayo and Ugandan Secretary of Health Titus Ariyo discuss the mass drug administration project during a radio broadcast with DJ Robert Musasizi.

How radio is saving lives in Uganda

In remote regions of Uganda, radio broadcasts are used to spread vital information about diseases such as lymphatic filariasis, and how to treat them.

Read more

Find out about other diseases we treat

Neglected tropical diseases

More about lymphatic filariasis

A close up photo of Leonard Kalokol, a 13 years old school boy whose class has lessons in facewashing to help eliminate the blinding eye disease trachoma in Kenya.

Countries commit to eliminating neglected tropical diseases

Health ministers from Africa, Asia and South America have come together at the World Health Assembly in Geneva to commit to eliminating neglected tropical diseases in their countries.

May 2015
Children in northern Nigeria wait to receive medication as part of a mass drug distribution programme to treat NTDs.

Sightsavers’ Nigeria Country Director elected to key NTD role

Dr Sunday Isiyaku will lead the non-governmental development organisation coalition for neglected tropical diseases and eye health in Nigeria.

May 2017
A trainer in Uganda shows a student how to use a measuring stick to calculate drug dosages.

WHO shows progress made on eliminating neglected tropical diseases

The number of people at risk from neglected tropical diseases has fallen by 20 per cent in the past five years, according to WHO.

April 2017

Learn how we’re fighting disease