Answer: Not a parasite. Most closely resembles pollen. I included this case since the object in some of the photos resembles a helminth egg (Toxocara canis or Capillaria spp. comes to mind). The key to recognizing that this is not an egg is in the last photograph which clearly shows the pores in the thick [...]
The following were seen in a concentrated wet preparation of stool. No history is available. Identification?
Answer: As stated by cmassey, “Toxoplasma gondii. Criteria: rupturing cyst with what appear to be escaping tachyzoites. Morphology is crescent shape with a large nucleus and they appear to fit in the 4-8um by 2-3um size given in diagnostic literature.” Great job to everyone who wrote in! This case demonstrates a few nice features of [...]
The following brain touch-preparations were stained with giemsa and viewed with a oil immersion objective. Diagnosis?
Answer: Whipworm, Trichuris trichiura Congratulations to everyone who wrote in! You all recognized the long slender head and larger body which gives this worm it’s name ‘whipworm’. In this case, the worm was immediately recognizable, and the expression of eggs provided confirmatory identification. There are many other instances, however, when what is received in the [...]
The following worm was retrieved during a screening colonoscopy near the ileocecal valve:
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