Amebiasis MCQ Quiz | Infectious Diseases – Protozoal

Quiz Introduction

Welcome to this specialized multiple-choice quiz on Amebiasis, designed for MBBS students. This quiz will test your understanding of the protozoal infection caused by Entamoeba histolytica, a critical topic in Infectious Diseases. You will face 25 questions covering its epidemiology, life cycle, clinical manifestations (from asymptomatic carriage to fulminant colitis and extra-intestinal disease like liver abscess), diagnosis, and management strategies. This is an excellent opportunity to reinforce your knowledge and prepare for examinations. After submitting your answers, you will receive your score and a detailed review of each question. You can also download a PDF copy of all questions and their correct answers for future revision. Good luck!

1. What is the causative agent of amebiasis?

2. “Anchovy sauce” or “chocolate-colored” pus is a characteristic feature of which condition?

3. Which is the infective stage of Entamoeba histolytica?

4. The presence of ingested red blood cells within a trophozoite is pathognomonic for:

5. What is the drug of choice for treating invasive amebiasis, such as amebic dysentery and liver abscess?

6. The characteristic “flask-shaped” ulcers in intestinal amebiasis are most commonly found in which part of the gastrointestinal tract?

7. Why is a luminal amebicide like Paromomycin or Diloxanide furoate given after a course of Metronidazole for invasive amebiasis?

8. The most common site for extra-intestinal amebiasis is the:

9. Which non-pathogenic amoeba is morphologically indistinguishable from E. histolytica on light microscopy?

10. Excystation of E. histolytica cysts primarily occurs in the:

11. A key virulence factor of E. histolytica that helps in tissue invasion is:

12. What is the most reliable method to differentiate E. histolytica from E. dispar in a laboratory setting?

13. Which of the following is a potential life-threatening complication of amebic colitis?

14. The mode of transmission for amebiasis is primarily:

15. A patient is diagnosed as an asymptomatic carrier (cyst passer) of E. histolytica. What is the most appropriate treatment?

16. The motile, feeding, and pathogenic stage of E. histolytica is the:

17. Serological tests for amebiasis (e.g., IHA, ELISA) are most useful for diagnosing:

18. Rupture of an amebic liver abscess into the pericardium can lead to:

19. Which of the following findings in a stool sample is most characteristic of amebic dysentery rather than bacillary dysentery?

20. The mechanism of action of Metronidazole involves:

21. What is an ameboma?

22. Which imaging modality is most commonly used for the initial evaluation of a suspected amebic liver abscess?

23. In the life cycle of E. histolytica, a single quadrinucleate cyst gives rise to how many trophozoites after excystation and division?

24. What are chromatoid bodies, often seen in the cysts of E. histolytica?

25. Cysts of E. histolytica are resistant to which of the following?