http://www.vetmed.ufl.edu/college/de...easeVirus.html
Inclusions can also be seen in lymphocytes and other white blood cells in peripheral blood films stained with Wright-Giemsa or the following modified hematoxylin and eosin (H&E) technique.
I have found this staining far superior than using Wright-Giemsa staining. With Wright-Giemsa staining the inclusions stain basophilic and may not be readily recognizable. With H&E staining, inclusions stain exactly the same as in tissues embedded in paraffin, sectioned and stained with H&E. Blood films should first be examined before tissue biopsies are obtained and submitted for histopathology. However, we do not know how often inclusions are seen in a peripheral blood film of a snake with IBD. It must be remembered that absence of inclusions in a blood film does not necessarily mean the snake is free of IBD.
So it CAN be determined from a blood test. If Dr. Jacobsen says it can be - it can be.
Quoting Melissa Kaplan is risky. She's an idiot. However, sometimes even a blind idiotic slug of a lying pig finds an acorn now and then.