Tuesday, June 14, 2022

Case of the Week 686

This week's case was generously donated by Dr. Mike Mitchell and Laura Derderian. The following structure was seen in a stool concentrated wet mount specimen. It measures 27.5 micrometers in length. This was the only structure present in this specimen. Identification? What additional testing might also be useful in this case?




7 comments:

Anonymous said...

Sure looks like an egg of Cystoisospora (formerly Isospora) An acids fast stain or PCR could confirm this but is not really necessary

Anonymous said...

Oocst of Cyclospora .. confirmed by intestinal biopsy

Idzi P. said...

Oocyst of Cystoisospora belli.

Anonymous said...

Beautiful oocyst of Cytoisospora belli. They auto fluoresce brightly under UV light excitation and will stain acid fast too. Our team members prefer the auto fluorescent methodology as it is simple and less time consuming.
Florida Fan

Anonymous said...

Yes I was about to say Isospora. I’m old-school and haven’t done Parasit. in years!

Anonymous said...

Old name was Isospora sp. and oocyst. Do a modified acid fast stain. Awesome find, too. Autofluorescence blue with right filter setup.

Unknown said...

Sporulated oocyst of Cystoisospora belli