Microscopy

Eggs of Fasciolopsis buski are broadly ellipsoidal, operculated and measure 130-150 µm long by 60-90 µm wide.  The eggs are unembryonated when passed in feces.  The eggs of F. buski can be difficult to distinguish from Fasciola hepatica, although the abopercular end of the later often has a roughened or irregular area.

A	B

A, B:  Eggs of F. buski in a unstained wet mount. Figure A was taken at 200× magnification; Figure B was taken at 400× magnification.

Adults of F. buski measure 20-75 mm long and have poorly-developed oral and ventral suckers.  Adults reside in the intestine of the mammalian host.

C

C:  Adult fluke of F. buski.  Image contributed by Georgia Division of Public Health.