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CHAPTER
3
Protozoal Microorganisms
as Intestinal Parasites
LEARNING OBJECTIVES
Upon completion of this chapter, the learner will be expected to:
■ Describe the life cycle of Giardia lamblia
■ Differentiate between cyst and trophozoite stages of protozoa
■ List steps necessary to perform wet mount on specimen from victim of amoebic dysentery
■ Differentiate between fresh cysts of Entamoeba histolytica and Entamoeba coli or Endolimax nana
cysts
■ Provide the probable origins of infections of Blastocystis spp. infections in humans
■ Compare the morphology of the various protozoans necessary for identification of each
■ Compare morphology of E. histolytica with common nonpathogenic amoebae
KEY TERMS
Amoebiasis Endoplasm Karyosome
Anaerobic Endosome Lugol’s iodine
Anoperineal region Enterocytes Macrogametes
Binucleate Febrile Merozoites
Brightfield microscopy Fecal-oral route Microgametes
Charcot-Leyden crystals Flagellates Microvilli
Chromatoid bodies Flatulence Mitochondrion-like organelles
Ciliates Fulminant colitis Multicellular
Colonoscopy Golgi apparatus Obligate
Cysts Gram negative rod Oocyst
Duodenal fluid Immunocompromised Oocytes
Dysentery Intestinal lumen Organelles
Ectoplasm Intracellular Periodontitis
Empyema Isosporiasis Phagocytosis
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