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| View Original: | Giardia lamblia.bmp.jpg (648x768) | |||
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| Keywords: Giardia lamblia.bmp.jpg en This digitally-colorized scanning electron micrograph SEM depicted a Giardia lamblia protozoan that was about to become two separate organisms as it was caught in a late stage of cell division producing a heart-shaped form The protozoan Giardia causes the diarrheal disease called giardiasis Giardia species exist as free-swimming by means of flagella trophozoites and as egg-shaped cysts It is the cystic stage which facilitates the survival of these organisms under harsh environmental conditions The cyst is considered the infective form and disease is often transmitted by drinking contaminated water As depicted in these SEMs in the intestine cysts are stimulated to liberate trophozoites Cysts can be shed in fecal material and can thereafter remain viable for several months in appropriate environmental conditions Cysts can also be transferred directly from person-to-person as a result of poor hygiene 1999 http //phil cdc gov/phil/details asp Dr Stan Erlandsen other versions Custom license marker 2015 05 13 http //phil cdc gov/phil/details asp Dr Stan Erlandsen Uploaded with UploadWizard Scanning electron microscopic images | ||||
