I am currently examining a stool sample from a patient with diarrhea, stained using the Ziehl-Neelsen method. I have observed numerous oval-shaped structures that stained blue. I would like to ask for help in identifying these structures.

I have attached an image for reference. Could these be encapsulated bacteria, spores, or some other form of microbial structures? Any insights or similar experiences would be greatly appreciated.

Thank you for your assistance.

Best regards, [Dr. Nuha