The trematode Heterophyes heterophyes, a minute intestinal fluke.

Symptoms

The main symptoms are diarrhea and colicky abdominal pain.  Migration of the eggs to the heart, resulting in potentially fatal myocardial and valvular damage, has been reported from the Philippines.  Migration to other organs (e.g., brain) has also been reported.

Diagnosis

The diagnosis is based on the microscopic identification of eggs in the stool.  However, the eggs are indistinguishable from those of Metagonimus yokogawai and resemble those of Clonorchis and Opisthorchis.

Treatment

Praziquantel is the drug of choice.

References

CDC