Minute intestinal fluke egg Minute intestinal fluke egg  

Topology of egg surface

Opisthorchis viverrini eggs in faecal smear can be differentiated from
eggs of minute intestinal flukes by adding 1% potassium permanganate
and roughness of egg shell surface is noted.

Left: O. viverrini eggs has a musk-melon surface pattern
Middle and right: Minute intestinal fluke eggs have rather smooth surface