Table 3. Infection intensity of A. lumbricoides, T. trichiura, and N. americanus as measured by WHO recommended thresholds and mean eggs per gram (epg) of stool.
| Infection intensity class | EPG | |||||
|---|---|---|---|---|---|---|
| Prevalence n (%) |
Light†a % (95% CI) |
Moderate†b % (95% CI) |
Heavy†c % (95% CI) |
Mean (SD) |
Range | |
| A. lumbricoides | 6 (0.08) | 66.67 (14.86–95.81) |
16.67 (0.91–81.39) |
16.67 (0.91–81.39) |
54, 264 (117,180.20) |
1–291, 868 |
| T. trichiura | 172 (9.08) | 90.70 (85.29–94.25) |
9.30 (5.75–14.71) |
0 | 478 (1248) |
1–8412 |
| N. americanus | 460 (54.51) | 85.65 (82.03–88.64) |
8.43 (6.16–11.14) |
5.92 (4.06–8.57) |
920 (1827) |
1–12,456 |
†Proportion of the population determined to be infected;
aThresholds for light intensity infections: A. lumbricoides (1–4999 epg), T. trichiura (1–999 epg), N. americanus (1–1999 epg);
bThresholds for moderate intensity infections: A. lumbricoides (5000–49,999 epg), T. trichiura (1000–9999 epg), N. americanus (2000–3999 epg);
cThresholds for heavy intensity infections: A. lumbricoides (≥50,000 epg), T. trichiura (≥10,000 epg), N. americanus (≥4000 epg).