Table 3.
Changes in the epidemiology of O. volvulus infection in the sentinel communities
| Community | 1989 survey | 2000 survey | 2004 survey | |||
| Prevalence (%) | MMFL | Prevalence (%) | MMFL | Prevalence (%) | MMFL | |
| Corriente Grande | 96.3 | 34.8 | 4.8 | 0.045 | 0.6 | 0.003 |
| El Tigre | 94.2 | 59.3 | 14.0 | 0.131 | 2.1 | 0.007 |
| San Miguel | 96.3 | 57.4 | 5.1 | 0.582 | 1.3 | 0.007 |
| Playa del Oro | 66.6 | 23.6 | 0 | 0 | 0 | 0 |
| Guayabal | 63.6 | 28.4 | 0 | 0 | 0 | 0 |
| Angostura | 80.6 | 34.7 | 0 | 0 | 0 | 0 |
| Naranjal | 53.3 | 21.2 | 0.3 | 0.001 | 0 | 0 |
The prevalence of infection and microfilarial load with O. volvulus in the sentinel communities is shown. Surveys were conducted in the seven sentinel communities before ivermectin treatment in 1989 and in 2000 and 2004 after the start of treatment. MMFL, Mean Microfilarial Load (geometric mean mf/mg skin).