The people of the African country of Sudan are still suffering from a wide variety of diseases that have been eliminated elsewhere in Africa, mainly because the country is engulfed in a vicious civil war that has prevented proper medical care and sanitation. For example, eight out of 10 reported cases of Guinea worm are found in Sudan, and many people in the country also suffer from river blindness; trachoma, another form of blindness; and leishmaniasis, a lethal disease spread by sand flies. The country has also had to deal with diarrhea, cholera, sleeping sickness, malaria, and polio. The civil war has made the treatments, inoculations, and health education campaigns needed to combat these diseases impossible. John C. Danforth, President Bush's envoy to Sudan, is currently trying to broker a ceasefire, so that polio immunization effort can take place in the Nuba Mountains.