18 Questions
What is the primary method for diagnosing Entamoeba histolytica infection?
Stool examination
Which of the following is a common symptom of amebic dysentery caused by Entamoeba histolytica?
Frequent, loose stools flecked with blood and mucus
Where do Entamoeba histolytica cysts form?
In the intestinal lumen
What is the maximum duration that Entamoeba histolytica cysts can survive in a feces-contaminated environment?
1 month
How do humans typically become infected with Entamoeba histolytica?
By drinking contaminated water
What is the characteristic that makes Entamoeba histolytica the only intestinal ameba to exhibit this trait?
Feeding on living host cells
What is the typical size range of the spherical to round cysts of Entamoeba histolytica?
Smaller than the trophozoites
Which of the following is a serious complication of Entamoeba histolytica infection?
Amebic abscess
What is the purpose of the hyaline cyst wall in Entamoeba histolytica cysts?
To provide structure and protection
What is the transformation that occurs in the chromatin material of young Entamoeba histolytica cysts?
It forms squared or round-ended chromatoid bars
What happens to the glycogen mass in Entamoeba histolytica cysts as they mature?
It usually disappears
How many nuclei are typically present in a mature, infective Entamoeba histolytica cyst?
Four
What is the method of choice for the recovery of E.coli trophozoites and cysts?
General stool examination
Which characteristic differentiates Trophozoite of E.histolytica from E.coli?
Presence of progressive, finger-like pseudopodia
What does the presence of E.coli in stool samples suggest?
Ingestion of contaminated food or drink
How can a technologist differentiate between pathogenic parasites and nonpathogenic E.coli in stool preparations?
By carefully examining for pathogenic characteristics in addition to E.coli
How many nuclei are typically found in a trophozoite of E.histolytica?
One
What is a characteristic feature of the cytoplasmic inclusion of Trophozoite of E.histolytica?
Coarse and unevenly distributed cytoplasm
Explore the unique characteristics of Entamoeba histolytica, the only intestinal ameba with distinct features, including ingested RBCs, peripheral chromatin, and pseudopodia. Learn about the morphology of trophozoites and cysts in parasitology.
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