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Detection of Intestinal Parasites


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Giardia intestinalis

Slide 12

March 2009

Here is what a concentrated fecal preparation looks like when it has been permanently stained. You’ll notice that the food material, bacteria, and parasites are still present and have taken on a mixture of green-ish blue and redish-purple hues. Again, it takes a lot of expertise to interpret this type of preparation, but an experienced eye will pick out the Giardia cysts in the bottom right-hand corner of this slide.

Giardia intestinalis


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