9.) A 10-year-old boy with symptoms of meningitis and a history of swimming in h

Question

9.) A 10-year-old boy with symptoms of meningitis and a history of swimming in his farm pond was brought to the hospital emergency department. Examination of his CSF revealed motile amoeba measuring 12 µm in diameter. Other laboratory results were consistent with bacterial meningitis. The most likely parasite is:

A. Acanthamoeba spp. trophozoites B. Entamoeba coli trophozoites C. Entamoeba histolytica trophozoites D. Naeglaria fowleri trophozoites

10.) Entamoeba hartmanni can be differentiated from Entamoeba histolytica based on:

A. Number of nuclei in the cyst B. Nuclear peripheral chromatin in the cyst C. Size of the cyst D. All of the above

11.) Which of the following criteria are used to identify ameba :

A. Shape and size of cyst B. Number of nuclei in cyst, the nuclear chromatin and position of the karyosome(endosome) C. The presence and shape of the chromatoidal bodies and glycogen vacuoles in the cytoplasm of cysts D. All of the above

Explanation / Answer

9. The answer is D. Naeglaria fowleri trophozoites as this is found in warm water bodies and it enters the central nervous system through nose generally during swimming, if the water is infected by amoeba.

10. Entamoeba histolytica has peripheral chromtic which can be used as a diffrentiating factor from Entameoa hartmanni.Number of nuclei are same in oth and sixe of the cyst is also same.

11. According to me all of the above criteria are important.

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