Foodborne trematode infections

Opisthorchiasis felinea

Recommendations for community diagnosis


There is insufficient information on the epidemiological pattern of opisthorchiasis felinea to generate adequate recommendations for public health control. As an interim measure, WHO recommends following the same guidelines as those for opisthorchiasis viverrini and clonorchiasis: community diagnosis carried out at the district level, and preventive chemotherapy implemented using single administrations of praziquantel at 40 mg/kg, 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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