Parasitology Diagnosis and Life Cycle Quiz
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Questions and Answers

What is the infective stage for the definitive host in the life cycle described?

  • Sporozoites
  • Merozoites
  • Bradyzoites (correct)
  • Sporocysts

    • Which cells do sporozoites enter after they rupture from sporocysts in the intermediate host?

  • Endothelial cells of blood vessels (correct)
  • Muscle cells
  • Liver cells
  • Epithelial cells

    • How do humans become infected with the parasite according to the text?

  • By inhaling contaminated air
  • By drinking contaminated water
  • By eating undercooked meat (correct)
  • Through mosquito bites

    • Where in the human body do bradyzoites released from ruptured cysts invade?

    <p>Intestinal epithelium (B)</p> Signup and view all the answers

    What is the result of the fusion of male and female gametes in the life cycle described?

    <p>Formation of oocysts (B)</p> Signup and view all the answers

    What can be detected in feces due to the fragile nature of the oocyst wall?

    <p>Individual sporocysts (B)</p> Signup and view all the answers

    What is the size range of Rainey's corpuscles in giardiasis?

    <p>12-16 × 4-9 mcm (B)</p> Signup and view all the answers

    How are the spores or bradyzoites in giardiasis described in terms of shape?

    <p>Rounded, ovoidal, or sickle-shaped (B)</p> Signup and view all the answers

    What is the main clinical manifestation of the intestinal stages of cryptosporidium?

    <p><strong>Diarrhea</strong> and abdominal pain (D)</p> Signup and view all the answers

    What is the diagnostic significance of mature cysts in giardiasis?

    <p><strong>Unknown</strong> (D)</p> Signup and view all the answers

    How are oocysts transmitted in cryptosporidiosis?

    <p><strong>Swallowed</strong> in contaminated water or food (C)</p> Signup and view all the answers

    What is the main way to diagnose the presence of sarcosysts?

    <p><strong>Histology</strong> (B)</p> Signup and view all the answers

    Where does the sexual phase of typical two-host coccida occur?

    <p>Intestinal mucosa of carnivorous animals (D)</p> Signup and view all the answers

    Which parasite is known for being very tolerant to chlorine disinfection due to its outer shell?

    <p>Cryptosporidium (D)</p> Signup and view all the answers

    What is a common symptom experienced by some patients infected with typical two-host coccida?

    <p>Transient diarrhea (A)</p> Signup and view all the answers

    Where does Sarcocystis primarily develop in the human body?

    <p>Muscles (A)</p> Signup and view all the answers

    How does infection with typical two-host coccida present in immunocompetent hosts?

    <p>Self-limited diarrhea (D)</p> Signup and view all the answers

    What is the most common mode of transmission for Cryptosporidium?

    <p>Water (drinking and recreational water) (A)</p> Signup and view all the answers

    What is a characteristic of chronic Toxoplasma infections?

    <p>Presence of tissue cysts (C)</p> Signup and view all the answers

    Which stage of the Toxoplasma life cycle occurs in felines, but not in humans and other intermediate hosts?

    <p>Oocyst (C)</p> Signup and view all the answers

    How is toxoplasmosis usually discovered in immunosuppressed hosts?

    <p>At autopsy (D)</p> Signup and view all the answers

    Which staining technique is mentioned to be good for staining smears of body fluids and tissue imprints in Toxoplasma diagnosis?

    <p>Giemsa stain (A)</p> Signup and view all the answers

    What is the primary approach for diagnosing toxoplasmosis according to the text?

    <p>Serology testing (C)</p> Signup and view all the answers

    In the Sabin-Feldman Dye Test Procedure, what happens if anti-Toxo antibodies are present in the patient serum?

    <p>The antibody-antigen complex activates complement to lyse the parasite membrane (D)</p> Signup and view all the answers

    How do cats become infected with Toxoplasma gondii?

    <p>By consuming intermediate hosts harboring tissue cysts (C)</p> Signup and view all the answers

    What happens to the oocysts shed by the parasite in a cat's feces?

    <p>They sporulate in 1-5 days and become infective (D)</p> Signup and view all the answers

    How do humans typically become infected with Toxoplasma gondii?

    <p>Consuming contaminated soil, water, or plant material (C)</p> Signup and view all the answers

    What is the role of tachyzoites in the Toxoplasma gondii life cycle?

    <p>They spread throughout the body via blood and lymphatic vessels (D)</p> Signup and view all the answers

    What is the consequence of a pregnant woman becoming infected with Toxoplasma gondii for the first time during pregnancy?

    <p>Transmission of the parasite to the fetus through the placenta (A)</p> Signup and view all the answers

    What makes tissue cysts formed by Toxoplasma gondii particularly resistant?

    <p>Their resistance to most treatments (B)</p> Signup and view all the answers

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