Fig. 2From: Sustained preventive chemotherapy for soil-transmitted helminthiases leads to reduction in prevalence and anthelminthic tablets requiredPrevalence of STH (first row), Ascaris lumbricoides (second row), hookworm (third row) and Trichuris trichiura (fourth row) infections in countries before (left column) and after (right column) ≥ 5 years of preventive chemotherapy with effective coverage. Each dot represents a published study or WHO EPIRF data. The size of the dot indicates the number of people assessed. The red square indicates pooled and weighted mean prevalence with 95% confidence intervals. WHO: World Health Organization; EPIRF: Epidemiological data reporting formBack to article page