One wind-sculptured monolith is called the Yei-Bi-Chei, an important holy figure among Navajos.
Pilot trials (pdf) have been conducted in Hampshire in the UK, Yei civil hospital in South Sudan, and Vailola hospital in Tonga.
Access to the area around Yei is complicated by a long-running security threat posed by a Ugandan rebel movement, the Lord's Resistance Army LRAA), which operates in the area.
The outbreak has spread from the crossroads town of Yei to outlying villages and most recently to the capital of Southern Sudan, Juba.
Yei won the prize for the best newscaster for this year's ICDB.
The Jay Family, whose members come from Yei, 100km (62 miles) south-west of the capital, Juba, formed in 2010 with the object of spreading South Sudanese music to all parts of east Africa and beyond.
And, much to her excitement, Yei Danlette Suah won the prize for the best newscaster.
"I read the news three times today," Yei recalls.
The outbreak spread rapidly through Yei and has now reached surrounding villages.
If you do nothing, the patient will not improve and will finally die.' (Elderly man in FGD, Kibuye, Burundi, 13 July 2007) In one setting (Yei, South Sudan), traditional healers made the distinction between the chronic condition mamali (considered very difficult to treat) and the more acute condition ngengere (easy to treat).
Dates are now set in September for performances in the southern cities of Nimule and Yei, with more to come.
