Ediriweera DS, Gunawardena S, Gunawardena NK, et al. - Through a cross-sectional, school-based, national survey using multistage stratified cluster sampling, covering all nine provinces as well as populations at high risk of soil-transmitted helminth infections living in urban slums and in plantation-sector communities, researchers reevaluated the national prevalence of soil-transmitted helminth infections to facilitate implementation of a more focused control programme that targets smaller administrative areas at risk of persisting transmission. A total of 5,946 children from 130 schools were involved. Among primary school children, the national prevalence of soil-transmitted helminth infection was 0·97%. Prevalence in the high-risk communities surveyed was higher than national prevalence ie, 2·73% and 9·02% in urban slum communities and in plantation sector communities, respectively. The least-level health administrative regions could be classified into low risk (prevalence < 1%), high risk (prevalence > 10%), or intermediate risk (1–10%) areas. In conclusion, the national prevalence of soil-transmitted helminth infection had proceeded to decline in Sri Lanka. Based on the WHO guidelines, discontinuation of routine deworming in low-risk areas, the continuation of annual deworming in high-risk areas, and deworming once every 2 years in intermediate-risk areas, for at least 4 years was suggested.