Monday, January 1, 2018

Case of the Week 475

Happy New Year! This week's case is by Idzi Potters and the Institute of Tropical Medicine Antwerp. The following were seen in an unfixed stool specimen at 400X original magnification. (Hint: maximize the size of the video for best viewing). Identification?

20 comments:

William Sears said...

Giardia

M.C. Martín R. Hernández C. said...

Chilomastix mesnilii trophozoites

ali mokbel said...

This "rotary" motion is a classic for Chilomastix mesnili troph.

ali mokbel said...

The rotary motion is obvious in the first video but not so in the second one.

Anonymous said...

Based on the corkscrew motility in the first video, I would also suspect Chilomastix. Is the spiral motility common across the genus? If so, and (based on the video headers and nothing more) the stool is from a cow, the species could be C. caprae.

Anonymous said...

Mancano le dimensioni! Comunque è un Flagellato

Carlo Varlani

Anonymous said...

Happy New Year everyone, the elongated conical overall shape is compatible with that of Chilomastix mesnili trophozoite. When we further mganify the organism, we can see at times a whipping flagellum.
Florida Fan

Atiya Kausar said...

Chilomastix mesnili motility is typical and morphology can be seen a little clear in second video

Unknown said...

This is Giardia Intestinalis trophozoites

Anonymous said...

This is Pentatrichomonas hominis trophocyte

Idzi P. said...

My best wishes for 2018 to all of you!
May the upcoming year provide us with lots of exceptional parasites! ;-)
About this case:
Dr. Pritt always sets the headers as “COW#”, even though it is a human sample... so to clarify: this case is from a watery human feces...
The size of the structures is 12-13 um, I’m sorry we forgot to mention this before...
Kind regards!
Idzi

Bobbi Pritt said...

Thank you for clarifying this Idzi. I should note that COW is just my abbreviation for Case of the Week. So there are no bovines involved!

A bit of history: My use of the term "COW" goes back to my days as a pathology resident where I was involved in the Pathology Interest Group (or PIG). We started a pathology COW, and therefore had a very animal-themed organization! I was involved in creating the weekly COW, and carried this into my days as a Clinical Microbiologist when I became the Director of the Clinical Parasitology lab at Mayo Clinic.

I apologize for any confusion! Bobbi

Anonymous said...

Haha that's fantastic. COW makes total sense now, but of course there had to be a bovine species of Chilomastix to make me outsmart myself.

- Mark Fox

Idzi P. said...

COWs and PIGs...
Wonderful!!!
Thanks for the explanation Dr. Pritt!
:-)

Anonymous said...

Happy New Year everyone. I have doubts between Chilomastix mesnili and Pentatrichomonas hominis. I can't see clearly enough on my monitor.

ali mokbel said...
This comment has been removed by the author.
Tâm Nguyễn Minh said...

Trichomonas hominis

Tâm Nguyễn Minh said...

Trichomonas hominis

VetParasitologist said...

There isn't a species of Chilomastix pathogenic in cows, for those wondering. And anything that has the species name "caprae" would likely be a from a caprine host meaning a goat.

Amazing Quotes said...
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