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[Toxocara canis] [Toxocara cati]

Eggs are not clinically diagnostic for human cases.  Humans are paratenic hosts for Toxocara spp. and eggs are found only in the feces of definitive hosts (cats and dogs).  Toxocara eggs are subspherical, thick-shelled and have a pitted surface.  The size range for the three most commonly observed species differs slightly: T. canis measure 80-85 micrometers by 75 micrometers; T. cati measure 65-75 micrometers; and T. leonina measure 75-85 micrometers by 60-75 micrometers.

A	B

A: Toxocara canis larva beginning to hatch.
B: T. canis larva hatching.

C

C: T. canis larva.