Arenavirus (IBD) viral test came back negative. The next way to try to more accurately diagnose IBD is with a biopsy of the esophagus, but that is difficult for any snake under 4 pounds. Next course of action is to finish the antibiotics and hope for improvement.
For reference: the IBD blood test has a 20% chance of a false negative.
In response to earlier suggestions, I asked the vet and this is what they said: "except for the neuro complex (which IBD is), none of the other would cause these signs. There is no history of heat stroke, and if it was a mild heat stroke he should be improving. A severe heat stroke would kill him in a few hours. Sinus infections would not cause neurological signs and cryptosporidium affects GI tract and causes weight loss."
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