Variables Intensity of infection Light (1-100 EPG) Moderate (101-399 EPG) Heavy (≥400 EPG) Age group (in years) 5-9 (n=17) 13(76.5%) 4(23.5%) 0(0%) 10-14 (n=149) 95(63.5%) 52(35.1%) 2(1.4%) ≥15 (n=33) 19(57.6%) 12(36.4%) 2(6.1%) Total 127(63.8%) 68(34.1%) 4(2%) Sex Male(n=114) 63(54.9%) 47(41.6%) 4(3.5%) Female (n=85) 64(75.3%) 21 (24.7%) 0(0%)

Table 2: The degree of intensity of S. Mansoni infection by age and sex among positive school children around Hizaty Wedicheber microdam in Merbmieti, Tigrai, Ethiopia. n:number EPG:eggs per gram