Foodborne trematode infections

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

MDA = mass drug administration
a The Kato-Katz thick smear technique should be used.

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