Bar chart indicating the number of infecting helminths (polyparasitism of soil-transmitted helminths plus S. haematobium) in four age groups of (A) rural Bandamaji and (B) peri-urban Dole. (A) age group 5–11 years: n = 55; age group 12–14 years: n = 42; age group 15–59 years: n = 152; age-group ≥60 years: n = 21. (B) age group 5–11 years: n = 51; age group 12–14 years: n = 32; age group 15–59 years: n = 79; age-group ≥60 years: n = 22.