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Eukaryotic Parasites (Protozoa) Drs. Babcock and Hopkins Spring 2009. Entamoeba histolytica (amebiasis, severe diarrhea). Acquired through consumption of contaminated food or water. Trophozoite is feeding and reproducing stage and causes disease. Cyst is circular and
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Eukaryotic Parasites(Protozoa)Drs. Babcock and HopkinsSpring 2009
Entamoeba histolytica (amebiasis, severe diarrhea) Acquired through consumption of contaminated food or water. Trophozoite is feeding and reproducing stage and causes disease. Cyst is circular and is what is ingested. Trophozoite forms pseudopodia. Target nuclei in both.
Balantidium coli (balantidiasis) Trophozoite has cilia. Cyst does not. Large nucleus. Can cause diarrhea and in severe cases ulcers and abscesses that can lead to dysentery and death.
Giardia intestinalis - giardiasis 2 nuclei Flagella on Trophozoite.
Trichomonas vaginalis life cycle Single nucleus Flagella. NO CYST form. Vaginitis with malodorous discharge and pruritis.
Trypanosoma brucei Flagellated. Seen in blood Smear outside of RBCs. Tsetse fly Arthropod vector, Tsetse fly. Infection through bite and causes African Sleeping Sickness.
Plasmodium falciparum Seen in blood smear inside RBCs. Undergoes schizogony. Causes Malaria Arthropod vector - Anopheles is vector
Plasmodium falciparum Plasmodium vivax Plasmodium ovale Plasmodium malariae
Toxoplasma gondii Produce toxoplasmosis iIn humans when cysts ingested. transplacental transfer can occur.
Eukaryotic Parasites The HelminthsCestodes = TapewormsTrematodes = FlukesNematodes = Roundworms
Ascaris lumbricoides life cycle Roundworm, dioecious. Both male and female worms.
Clonorchis sinensis life cycle(Oriental liver fluke-Trematode) Metacercariae are cystlike and dormant and ingested. Maturation occurs in small Intestine. Snail, intermediate host
Clonorchis sinensis worm Monoecious, have both male and female sex organs.
Dipylidiumcaninum scolex and proglottidsstrobilia, immature, mature and gravid.
Echinococcus granulosus – hydatid cysts tapeworm. Small, only 3 proglottids. Hydatid sand, cysts in infected tissue.
Echinococcus granulosus worm and eggs Hooks on eggs for attachment
Encysted scolices of Echinococcus granulosus in lung ("hydatid sand“)
Enterobiusvermicularis (pinworm) Nematode, dioecious
Ancylostoma (hookworm), nematode. Ancylostoma
Ancylostoma (hookworm) Burrows through skin, enters bloodstream and travels to lungs. Swallowed and Establishes in intestine. Attaches and consumes host blood.