Table 1. WHO treatment guidelines for schistosomiasis, according to estimated prevalence.

Adapted from [6,9].

Endemicity level	Schistosomiasis prevalence (pooled species) based on parasitological methods	WHO recommended treatment strategy
Non-endemic	<1%	No treatment
Low	≥1% and <10%	Treat school-age children twice during primary school years
Moderate	≥10 and <50%	Biennial treatment of all school-age children; as well as special risk groups in adults
High	≥50%	Annual treatment of all school-age children; as well as special risk groups in adults