AlJazeeraEnglish: Hundreds of children in southern Sudan have died from a mysterious illness that they have called the "nodding disease". The mentally and physically disabling disease, which has no cure yet and affects only children, first emerged in Sudan in 1980s.

"We have no clue as what is causing this. It's like a detective novel and a murder mystery, because it's fatal," says a tropical disease specialist from UNICEF.

Bizarrely, the seizures occur when the sufferers start to eat, or when it is particularly cold. When a bowl of sorghum is placed in front of Susannah, the "nodding" begins almost immediately, and stop when she has finished eating.

Some villagers say the disease is a curse, others blame the country's long civil war and suspect that government forces have been dropping chemical weapons.

93% of those surveyed are infected with a parasitic worm which causes Onchocerciasis (also known as river blindness). However, the level of infection among children without "nodding" is 63%. The worm is carried by black flies which breed near fast-flowing rivers.

A team of CDC experts conducts a multifaceted investigation in northern Uganda. An Epidemic Intelligence Service Officer tells the story about Nodding Disease, a neurologic syndrome which is devastating to afflicted children.

References:
'Nodding disease' hits Sudan. BBC, 2003.