Intestinal FlagellateGiardia lamblia
Giardia lamblia Intestinal Flagellate
IntroductionGiardialamblia:giardiasiszoonosisis one of the major causes of parasiticdiarrhea-"traveler's diarrhea);isthe only commonpathogenicprotozoanfound in the duodenum and jejunum ofhumans,who are the only importantreservoir ofthe infection
Introduction Giardia lamblia: giardiasis－zoonosis is one of the major causes of parasitic diarrhea—”traveler’s diarrhea); is the only common pathogenic protozoan found in the duodenum and jejunum of humans, who are the only important reservoir of the infection
MorphologyGiardia exists in two forms:the trophozoiteandthecystformsTrophozoite9~21μmx5~15μmx2~4μmhalf-pearwithsymmetryfour pairs of flagellaAlargeconcavesuckingdiskontheventral surface helps theorganismto adhereto intestinal villiApairs of nuclei inthesuckingdisk
Morphology Giardia exists in two forms: the trophozoite and the cyst forms. Trophozoite: 9～21µmx 5～15µm x 2～4µm half-pear with symmetry four pairs of flagella A large concave sucking disk on the ventral surface helps the organism to adhere to intestinal villi A pairs of nuclei in the sucking disk
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MorphologyCyst:oviod,thick-walled,highlyresistant, and 8-14 μm in lengththey contain two nuclei asimmatureformsandfour asoO:maturecysts.2
Morphology Cyst: oviod, thick-walled, highly resistant, and 8–14 µm in length; they contain two nuclei as immature forms and four as mature cysts