loiasis

Loiasis is a parasitic disease caused by the nematode Loa loa, commonly found in central and western Africa. It is transmitted to humans through the bite of infected deerflies (Chrysops).12

The Loa loa larva enters the skin and migrates through the bloodstream, often settling in the eye or under the skin. Adult worms can cause itching and swellings. The female worm produces microfilariae, which enter the bloodstream and are ingested by deerflies, continuing the cycle of infection. While loiasis can cause discomfort and visible worms in the eye, it rarely results in permanent damage. Treatment involves surgical removal of worms and drug therapy.12