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Image of the Week for April 2, 2007

Parasitic Diseases. Fasciola hepatica eggs. Wet mounts with iodine. The eggs are ellipsoidal. They have a small, barely distinct operculum (A, B, upper end of the eggs). The operculum can be opened (egg C), for example when a slight pressure is applied to the coverslip. The eggs have a thin shell that is slightly thicker at the abopercular end. They are passed unembryonated. The size ranges from 120 to 150 µm by 63 to 90 µm. Fascioliasis is caused by the sheep liver fluke infecting the liver and biliary system. See Parasitic Diseases in Red Book Online text

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