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Giardiasis
[Giardia intestinalis (syn. Giardia lamblia)]

Giardia intestinalis trophozoites are pear-shaped and measure 10-20 micrometers in length.  In permanent, stained specimens, 2 large nuclei are usually visible.  The sucking disks (used for attaching to the host’s mucosal epithelium), median bodies, and flagella (8) may also be seen.

G. intestinalis trophozoite stained with trichrome G. intestinalis trophozoite stained with trichrome
A B

A, B: G. intestinalis trophozoites stained with trichrome.

G. intestinalis trophozoite stained with trichrome G. intestinalis trophozoites
C D

C: Giardia intestinalis trophozoites stained with trichrome.
D: G. intestinalis trophozoites.  Image contributed by the Vermont Department of Health Laboratory.

 
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