Prevalence and intensity of S. mansoni infection along the shores of Lake Tana, Ethiopia.

The prevalence and intensity of infection along the shores of Lake Tana was studied. Out of 472 students examined the prevalence of S. mansoni was 29% (CI = 25%, 33%). The intensity of infection was moderate (Geometric chi eggs per gram of stool = 289). Of the 137 positive, 21.2% had heavy infections (> 800 epg). The prevalence and intensity of infection was high in the age group 10-14 years. Reduction in morbidity is recommended as top priority in the control of schistosomiasis.