Here are more pic of the pathogen with hemotoxylin staining. Although still hard to see the details, someone told me they are eukaryotic rather than prokaryotic due to the considerable size compared with E.coli. Any more helpful suggestions out there?

I'm a PhD candidate in a Biochemistry lab. Basicaly I have the access to amost any kind of antibiotics, antifungics,and antiseptics, as well as microscopes. I did follow a vet's suggestion, and was trying those antibiotics very carefully according to the articles on tortoisetrust.com. And I dont wanna take a risk to Baytril, due to the potential impairs to the bone/joint development of junior tortoises. I hope somebody can help me id the pathogen, so I could treat them more specifically.

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