Diagnostic Findings [Last Modified: ]
[Clonorchis sinensis]
Causal Agent Life Cycle Geographic Distribution Clinical Features Laboratory Diagnosis Treatment

Microscopy

Clonorchis sinensis eggs are small, ranging in size from 27 to 35 µm by 11 to 20 µm.  The eggs are oval shaped with a convex operculum, that rests on visible "shoulders," at the smaller end of the egg.  At the opposite (larger, abopercular) end, a small knob or hooklike protrusion is often visible.  The miracidium is visible inside the egg.

Clonorchis sinensis eggs Clonorchis sinensis eggs
A B

A, B: Clonorchis sinensis eggs.  The small knob at the abopercular end is visible in A.  Also note the operculum resting on "shoulders" in B; image taken at 400× magnification.

 
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