Protozoa and Worms Flashcards
What are the three groups of protozoans?
- Amebae: single-celled organisms
- Flagellates: distinguished by flagellum
- Coccidians: have structures that resemble cocci
What are the three groups of helminths?
- Trematodes: Schistosoma
- Nematodes: Ascaris, Strongyloides, Ancylostoma, Necator, Enterobius, Trichinella, Wuchereria
- Cestodes: Taenia, Diphyllobothirum, and Echinococcus
Visceral Leishmaniasis will present with ________________ in the cytoplasm of macrophages.
amastigotes
The ____________ form of Leishmania is transmittable.
promastigote
Describe the forms of amastigote, promastigote, epimastigote, and trypomastigote.
- Amastigote: small, circular, tiny flagellum
- Promastigote: elongated, flagellum present on the tip of organism
- Epimastigote: elongated, flagellum coming from middle of organism
- Trypomastigote: elongated, flagellum comes from opposite end of organism as the tapered tip
Sketchy notably omitted one sign from Chagas disease: ___________.
Romaña’s sign –periorbital edema
What histologic sample is characteristic of E. histolycia?
RBCs within trophozoites (like the red cups in the trophozoite puddle)
Trichomonas has multiple ___________ and does not make _____________.
flagella; cysts
_____________ staining can reveal Giardia lamblia.
Trichrome
______________ are characteristic of amastigotes.
The “pair of dots” sign
Cyclospora is often confused with Cryptosporidium because both stain acid-fast. How are they different?
Cyclospora is larger
How can you differentiate schizonts from gametocytes?
Schizonts are round cells with many round dots inside. Gametocytes are longer and slender.
A patient presents with myalgia after making sausage. What other symptoms might he have?
Conjunctivitis and vomiting (like Mr. Porky with the red glasses and green drool)
What shape is typical of the Enterobius vermicularis egg?
Flat on one side and curved on the other
What nematodes have a pulmonary phase?
- Strongyloides stercoralis
* Ascaris lumbricoides