2011intestflagel - Intestinal and Urogenital Flagellates...

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Intestinal and Urogenital Flagellates • Phylum Sarcomastigophora • Subphylum Mastigophora (flagellates) • Class Zoomastigophorea – Order Retortamonadida – Genera: Chilomastix, Retortamonas – Order Diplomonadida • Suborder Diplomonadina – Genus: Giardia – Order Trichomonadida – Genera: Dientamoeba, Trichomonas. Pentatrichomonas
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Intestinal and Urogenital Flagellates • Phylum Sarcomastigophora • Subphylum Mastigophora (flagellates) • Class Zoomastigophorea – Order Retortamonadida – Genera: Chilomastix, Retortamonas – Order Diplomonadida • Suborder Diplomonadina – Genus: Giardia – Order Trichomonadida – Genera: Dientamoeba, Trichomonas. Pentatrichomonas
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Giardia lamblia = G. duodenalis= G. intestinalis • Parasite morphology • Trophozoite: – Size (14x12um) – adhesive disc – Microtubules and microfilaments – Two nuclei - central karyosome – Flagellar –4 pairs – Parabasal body – Median bodies? Genome size: 11.7Mb; ~4500 protein coding genes Division is longitudinal binary fission
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• Cysts are ovoidal. – flagellar retract, cytoplasm condenses – Thin but tough membrane forms cyst wall • Immature cysts have two nuclei • Mature cysts have 4 nuclei
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Life Cycle
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Epidemiology • Giardia is most prevalent intestinal parasite. • Has world wide distribution. Common in children 6-10 years of age. Daycare centers Also prevalent in homosexual males. • travelers or visitors to endemic areas (immunity?). • Primary immuno-deficiency (IgA deficiency) Recent increase in Giardia infection among wilderness campers – Backpacker’s disease (may be acquired from contaminated water) Wild animals: Beavers; Dogs; sheep are also infected by Giardia
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Pathogenesis Incubation period - 1-2 weeks before onset of symptoms. It may take longer for cysts to appear in stool. May require 10 to 100 cysts to establish infection (strain dependent). Prolonged duration of diarrhea
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This note was uploaded on 11/21/2011 for the course ZOO 4232 taught by Professor Kima during the Fall '10 term at University of Florida.

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2011intestflagel - Intestinal and Urogenital Flagellates...

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