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Table 1 Prevalence and intensity of S mansoni and hookworm in children aged 9-14 years before and 6 months after praziquantel and mebendazole administration by district and by sex

From: Mass drug administration significantly reduces infection of Schistosoma mansoni and hookworm in school children in the national control program in Sierra Leone

  Pre-MDA Post-MDA Reduction (%)
  No of children examined S.mansoni Hookworm No of Children examined S.mansoni Hookworm S.mansoni Hookworm
Prevalence (%)
Overall 515 69.0 (64.7-73.2) 41.7 (37.3-46.4) 448 38.2 (33.8-42.8) 14.5 (11.6-18.1) 44.6 65.2
By district         
   Bo 60 33.3 (22.7-45.9) 48.3 (36.2-60.7) 60 21.7 (13.1-33.6) 26.7 (17.1-39.0) 34.8 44.7
   Kailahun 60 56.7 (44.1-68.4) 21.7 (13.1-33.6) 60 25.0 (15.8-37.2) 11.7 (5.8-22.2) 55.9 46.1
   Kenema 38 73.7 (55.6-85.8) 50.0 (15.8-37.2) 29 41.4 (25.5-59.3) 10.3 (3.6-26.4) 43.8 79.4
   Koinadugu 177 82.9 (75.7-88.9) 47.3 (38.8-56.4) 120 45.0 (36.4-53.9) 12.5 (7.7-19.6) 45.7 73.6
   Kono 120 75.0 (66.6-81.9) 32.5 (24.8-41.3) 119 50.4 (41.8-59.3) 10.9 (6.5-17.8) 32.8 66.5
   Tonkolili 60 75.0 (62.8-84.2) 58.3 (45.7-69.9) 60 28.3 (18.5-40.8) 18.3 (10.6-29.9) 62.3 68.6
By sex         
   Boys 262 69.4 (63.2-75.0) 50.8 (44.2-57.1) 227 40.1 (33.9-46.6) 19.4 (14.8-25.0) 42.2 61.8
   Girls 252 68.9 (62.7-74.8) 32.5 (26.9-39.2) 221 36.2 (30.2-42.7) 9.5 (6.3-14.1) 47.5 70.8
Intensity of infection (epg)
Overall 515 170.8 (84.2-257.3) 71.7 (44.1-99.3) 448 47.3 (11.2-83.4) 8.7 (3.5-14.0) 72.3 87.9
By district         
   Bo 60 36.0 (0-114.4) 84.4 (31.8-137.0) 60 6.4 (2.8-10.0) 13.6 (4.7-22.5) 82.2 83.9
   Kailahun 60 53.6 (32.2-75.0) 14.4 (0-32.2) 60 22.1 (0-44.6) 4.0 (2.2-5.8) 58.8 72.2
   Kenema 38 111.8 (61.4-162.2) 79.6 (42.9-116.2) 29 31.4 (6.1-56.8) 4.1 (0-9.6) 71.9 94.8
   Koinadugu 177 172.5 (133.8-211.2) 107.3 (9.9-204.7) 120 55.8 (13.2-98.4) 8.6 (0-22.0) 67.7 92.0
   Kono 120 326.6 (14.3-638.9) 28.0 (21.1-34.9) 119 86.9 (0-214.2) 8.1 (0-17.9) 73.4 71.1
   Tonkolili 60 137.2 (0.8-273.6) 128.4 (116.8-140.0) 60 25.6 (0-55.9) 12.4 (0-31.1) 81.3 90.3
By sex         
   Boys 262 165.4 (90.9-239.9) 89.5 (45.1-133.9) 227 57.1 (4.8-109.4) 14.1 (3.9-24.3) 65.5 84.2
   Girls 252 177.2 (73.7-280.6) 53.5 (32.6-74.5) 221 37.2 (15.8-58.7) 3.3 (1.4-5.2) 79.0 93.8