Opisthorchiasis viverrini
Recommendations for community diagnosis
For the purposes of public health control, WHO recommends carrying out community diagnosis at the district level, and implementing preventive chemotherapy with praziquantel at a dosage of 40 mg/kg, single administration, as indicated by the following table:
| District | Prevalence of infection in the sample populationa | Action to be taken | |
| Type of intervention and target population | Interval of re-treatment | ||
| High risk | ≥20 | Universal treatment (MDA) • Treat all individuals in the district | 12 months |
| Low risk | <20 | Option 1: universal treatment (MDA) • Treat all individuals in the district | 24 months |
| Option 2: targeted treatment • Treat all individuals in the district who report habitually eating raw fish | 12 months | ||