Fig. 4From: Estimation of changes in the force of infection for intestinal and urogenital schistosomiasis in countries with schistosomiasis control initiative-assisted programmesChanges in egg count for each of the countries and endemicity areas under praziquantel treatment in: a and b Schistosoma mansoni endemic areas (intensity measured as eggs per gram of faeces), and in c and d S. haematobium endemic areas (intensity measured as eggs per 10Â ml urine). Data were collected annually. The lines linking the data points are included for illustrative purposes are not verified parasitologically. These lines assume a constant force of infection and assume 95Â % efficacy of treatment for S. mansoni and 99Â % efficacy of treatment for S. haematobium Back to article page