Which of the following statement is true regarding Acanthamoeba keratitis?

A. For the isolation of the causative agent, corneal scraping should be cultured on a nutrient agar plate

B. The causative agent, Acanthamoeba is a helminth whose normal habitat is soil

C. Keratitis due to Acanthamoeba is not seen in the immunocompromised host

D. Acanthamoeba does not depend upon a human host for the completion of its life-cycle

Correct Answer: Acanthamoeba does not depend upon a human host for the completion of its life-cycle

Description: For the isolation of causative agent, corneal scraping should be cultured on non-nutrient agar (not nutrient agar). 'Culture on non-nutrient agar (E. coli enriched) may show trophozoites within 48 hrs : which gradually turn into yeasts. - khurana Normal habitat is soil, water and dust but it is an amoeba (not a helminth) Keratitis due to Acanthamoeba may be seen both in immunocompetent and immunocompromised hosts. In contrast to many another pathogenic amoeba, this organism is not naturally parasitic and does not require a host.

Category: Ophthalmology

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