Learn · Other diseases
Mosquitoes spread small worms that cause painful swelling. We can stop it.
Key facts
657 million people still need medicine to prevent it
36 million people live with swollen legs or a swollen scrotum
21 countries have already stopped it
Learn more
Mosquitoes carry very small worms. The worms damage the body’s lymph system (the system that drains fluid).
Years later, the legs or the scrotum can become very swollen. People sometimes call this “elephantiasis”.
The whole community takes medicine once a year for several years. This stops the worms from spreading.
These help stop painful attacks. A doctor can often fix a swollen scrotum with an operation.
Nets and fewer mosquitoes protect you from this sickness and from malaria.
Watch the episode
Watch this short cartoon episode from our free series, A World Without Malaria.
Sources: WHO Lymphatic filariasis fact sheet (November 2024).
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