Size: 10 µm    Most likely identification of the organism: [1] What is the structure in the center of this organism? [2]

Size: 17 µm   Stage: [1] Most likely identification of the organism: [2]

Size: 15.5 µm Stage: [1] Most likely identification of the organism: [2]

Size: 12 µm Stage: [1] Most likely identification of the organism: [2] What is the structure that the black arrow is pointing to in the figure above? [3]

Size: 27 µm Stage: [1] Most likely identification of the organism: [2]

Image Identification (complete scientific name AND life cycle stage) 25 μm, wet mount

 A 7-year-old boy was presented to his health care provider with symptoms of intermittent diarrhea, abdominal pain and loss of appetite. A stool specimen was collected in 10% formalin and zinc PVA (Zn-PVA) for routine ova-and-parasite (O&P) examination.  Figures A-D show what was observed at 1000x magnification with oil on a trichrome-stained smear made from stool preserved in the Zn-PVA.  The objects of interest measured 7-13 µm.  Figures A and B show the same object at different focal planes. What is your diagnosis? Based on what criteria? Provide extensive detail in order to receive full credit.

The usual site for human tapeworms is:

Which of the following organisms is most likely to be found in a corneal scraping specimen?

What is this object?