Table 4.
Prevalence and intensity of Schistosoma mansoni infection in relation to stool samples investigated among 13,119 schoolchildren (9–12 years of age), where 3 stool samples were obtained along the coast of Lake Victoria in Mwanza region, Tanzania
| Number of stool samples investigated | S. mansoni positives | S. mansoni positives in % (95% CI) | S. mansoni intensity (epg) of positives, GM (95% CI) |
|---|---|---|---|
| One (two smears) | |||
| Sample 1 | 5,181 | 39.5 (38.7–40.3) | 105.3 (101.3–109.4) |
| Sample 2 | 5,004 | 38.1 (37.3–38.9) | 107.9 (103.8–112.2) |
| Sample 3 | 4,811 | 36.7 (35.9–37.5) | 112.2 (107.8–116.8) |
| Mean | 38.1 | 108.5 | |
| Two (four smears) | |||
| Samples 1 and 2 | 6,363 | 48.5 (47.7–49.3) | 76.2 (73.3–79.2) |
| Samples 1 and 3 | 6,319 | 48.2 (47.4–49.0) | 77.5 (74.6–80.5) |
| Samples 2 and 3 | 6,028 | 45.9 (45.1–46.7) | 80.2 (77.2–83.4) |
| Mean | 47.5 | 78.0 | |
| Three (six smears) | |||
| Samples 1, 2, and 3 | 6,897 | 52.6 | 65.1 |
CI = confidence interval; epg = eggs per gram; GM = geometric mean.