Geographical targeting of interventions is required to ensure programmes are implemented appropriately, focusing resources on areas of greatest need.
Control strategies against worm infections, which focus predominantly on mass drug administration (MDA) with anthelmintic drugs, are most cost-effective when targeted to communities with the highest prevalence of infection and presumed greatest morbidity. The need for mass treatment is therefore determined by infection prevalence within mapping and treatment areas, as assessed by community or school surveys. Deworming is warranted when prevalence of infection exceeds WHO-recommended species specific prevalence thresholds.