4)Cestode infections caused by this organism can increase due to autoinfection.

Question

4)Cestode infections caused by this organism can increase due to autoinfection. No intermediate host is required. Eggs contain a hexacanth embryo with polar filaments.

A. Diphyllobothrium latum B. Echinococcus granulosa C. Hymenolepsis nana D. Taenia solium 5.) A stool specimen is submitted for ova and parasite. Eggs were found in the stool. The eggs measured 35-45µ. The eggs had radial striations and 3 pairs of hooklets. Based on this information, the following diagnosis can be made:

A. Taenia saginata B. Taenia solium C. Hymenolepsis dimunata D. Taenia ssp.

6.) A permanently stained fecal smear revealed several cysts containing eight nuclei that had clumped chromatin and eccentrically located karyosomes. There were splinter like chromatoidal bodies in the cytoplasm. The likely identity of this parasite is:

A. Entaemoeba gingivalis B. Entamoeba hartmanii C. Entamoeba coli D. Entamoeba histolytica

Explanation / Answer

4. C. Hymenolepsis nana. Internal autoinfection is the alternate mode of infection where eggs penetrates villi and continues the infection. An alternate mode of infection consists of internal autoinfection. The passage through external environment is not required.

5. A. Taenia saginata

6. C. Entamoeba coli

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