A woman who just returned from a trip to Southeast Asia has signs of biliary obstruction, which is confirmed by CT scan.Due to her recent travel history, the physician orders an O&P examination before considering surgical intervention.The following element is found in her fecal sample.The most likely identity of this organism is:

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The Chinese liver fluke, Clonorchis (Opisthorchis) sinensis, is geographically limited to the Far East, where dogs and cats serve as reservoir hosts.The adults live in the distal bile ducts.Repeated or heavy infections cause inflammation because of mechanical irritation, fever, diarrhea, pain, fibrotic changes, or obstruction of the bile duct.The diagnosis is made by finding the egg in a stool specimen.The egg is 29 to 35 mm long, embryonated when passed, flash shaped, and operculated with prominent shoulders at the operculum and a knob at the opposite end.CDC PHIL #5248

A Woman Who Just Returned from a Trip to Southeast