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Protozoan Infections and Life Cycle

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Questions and Answers

What is Entamoeba histolytica?

A type of sporozoan protozoan.
A commensal amoeba that does not cause disease in humans.
A pathogenic amoeba that can cause intestinal disease and liver abscess in humans. (correct)
A type of flagellated protozoan.

What is the main difference between the trophozoite and cyst stages of protozoa?

The trophozoite is found in soil, while the cyst is found in water.
The trophozoite is active, while the cyst is dormant. (correct)
The trophozoite has a protective membrane, while the cyst does not.
The trophozoite is dormant, while the cyst is active.

How is Entamoeba histolytica typically transmitted?

Through an infected mosquito bite.
Through direct contact with an infected person.
Through the fecal-oral route. (correct)
Through contaminated air.

What is the primary mode of diagnosis for Entamoeba histolytica?

Direct Fecal Smear (DFS) for trophozoites and Formalin Ether/Ethyl Acetate Concentration Test (FECT) for cysts. (C) Signup and view all the answers

What is the treatment for Entamoeba histolytica infection?

Metronidazole. (B) Signup and view all the answers

What is Entamoeba dispar?

A commensal amoeba that does not cause disease in humans. (A) Signup and view all the answers

What is the characteristic feature of the trophozoite stage of Acanthamoeba sp.?

Thorn-like appendages (C) Signup and view all the answers

What is the primary mode of transmission of Acanthamoeba sp.?

Contaminated food and water (A) Signup and view all the answers

What is the typical diagnosis for Acanthamoeba keratitis?

Epithelial biopsy or corneal scrapings (C) Signup and view all the answers

What is the primary prevention method for Acanthamoeba sp. infection?

Meticulous contact lens hygiene (A) Signup and view all the answers

What is the typical treatment for Acanthamoeba keratitis?

Surgical excision of infected cornea with corneal transplantation (D) Signup and view all the answers

What is the disease caused by Acanthamoeba sp. infection of the nasal tissue?

Granulomatous amebic encephalitis (GAE) (D) Signup and view all the answers

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