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Soil-transmitted helminthiasis (STHs) are poverty-related diseases with high prevalence rates in developing countries. The present study aims to describe the epidemiological scenario of STHs in an urban population in the Brazilian Amazon. A cross-sectional survey ( n  = 349 children aged 1–15 years) was carried out to obtain faecal samples and sociodemographic and sanitation data. Among the children, 143 (41%) were positive for at least one STH. Prevalence rates of infections by  A. lumbricoides ,  T. trichiura , and hookworms were 24.4%, 42.6%, and 9%, respectively. A logistic regression multivariate model showed that infection with  A. lumbricoides  is significantly more frequent in children aged 11–15 years (odds ratio [OR] = 2.38; 95% confidence interval [CI] = 1.15–4.94;  p =0.018) and the presence of latrines inside houses is a protection factor against ascariasis (OR = 0.38; 95% CI = 0.17–0.85;  p =0.019). Positivity for  T. trichiura  is higher in the 5–10 (OR = 3.31; 95% IC = 1.85–5.89;  p =0.001) and 11–15 age groups (OR = 3.16; 95% IC = 1.66–6.00;  p =0.001), in children living in poor families (OR = 1.78; 95% IC = 1.01–3.14;  p =0.045) and practicing open evacuation (OR = 2.07; 95% IC = 1.07–3.99;  p =0.029). Hookworm infection is more frequent in children aged 11–15 years (OR = 6.70; 95% IC = 1.91–23.43;  p =0.002), males (OR = 6.35; 95% IC = 2.00–20.14;  p =0.002), and those living in stilt houses (OR = 3.52; 95% IC = 1.22–10.12;  p =0.019). The use of albendazole in the last six months was a protection factor against hookworm infection (OR = 0.31; 95% IC = 0.10–0.96;  p =0.042). The proportion of mild, moderate, and severe infections was 55.2%, 37.8%, and 7%, respectively, for  A. lumbricoides , 72.4%, 24.3%, and 3.3% for  T. trichiura , and 93.8%, 3.1%, and 3.1% for hookworms. Significantly higher worm burdens in  T. trichiura  and hookworm infections were associated with practicing open defecation and living in stilt houses. The data points to the need to improve sanitation infrastructure in Amazonian cities with similar sociodemographic and environmental characteristics.

journal of tropical medicine

Socioenvironmental Factors Influencing Distribution and Intensity of Soil-Transmitted Helminthiasis in the Brazilian Amazon: Challenges for the 2030 Agenda