Tuesday, March 7, 2017
Case of the Week 437
This week's case was generously donated by Dr. Mike Mitchell and Janice Gotham. This is a trichrome-stained stool specimen. While the diagnosis may seem straight-forward, there is a question in what to call this organism based on some new proposed nomenclature changes. Please tell me how you think this parasite should be reported out to the patient's physician. Dr. Stensvold, I'm particularly interested in your opinion!
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Well, I'd suggest Blastocystis sp. (With Blastocystis in italics)
I concur - or just Blastocystis.
Blastocystis sp.
I would report for Dr. Stensvold that It looks like a Blastocystis species which is found in almost every stool specimen even for those healthy people. The treatment of this organism by antiprotozoal drugs can reduce the symptoms of the GI tract but may not eliminate the organism. There is a debate on its classification and pathology. It thought to be a yeast and then a protozoan but the scientists have agreed after gene sequencing to classified this organism under Stramenopiles group which includes brown algae, diatoms, etc.
So no takers for Blastocystis hominis? ;)
I usually report as Blastocystis hominis.
We report as Blastocystis hominis
Blastocystes species
Up until now, we are reporting these organisms as Blastocysts sp. We are not specialized in the nomenclature nor classification and will be delighted to learn.
Florida Fan
Well I thought that Blastocystis hominis refers to a collection of species - I think that's how they report it in the lab I work at.
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