| guinea worm disease in ayod, upper nile province, southern sudan: a cross-sectional study. | upper nile province is one of the four main endemic areas for guinea worm disease in the sudan. in december 1994, a survey was conducted in the village of ayod where the disease is endemic, to investigate morbidity and local knowledge of transmission and prevention. interviews were conducted in households selected by standard cluster sampling procedures and of the 759 people examined, 156 (20.6%) had guinea worm lesions. adjusted odds ratios were used to estimate the relative risk for people wit ... | 1996 | 8673816 |