Giardia infecting a small intestine
A scanning electron micrograph of the surface of the small intestine of a gerbil infested with Giardia sp. protozoal, present in the trophozoite stage.
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"Giardia-spp.--infected--gerbil-intestine."
http://en.wikipedia.org/wiki/File:Giardia-spp.--infected--gerbil-intestine.jpg
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