DescriptionGiardia lamblia in a late stage of cell division.jpg
English: 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.
Cette œuvre a été placée dans le domaine public par son auteur, http://phil.cdc.gov/phil/details.asp Dr. Stan Erlandsen. Ceci s’applique dans le monde entier. Dans certains pays, ceci peut ne pas être possible ; dans ce cas : http://phil.cdc.gov/phil/details.asp Dr. Stan Erlandsen accorde à toute personne le droit d’utiliser cette œuvre dans n’importe quel but, sans aucune condition, sauf celles requises par la loi.
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