Well, you know that URI can take time. I've heard of snakes being on meds for a couple of month before they completely got rid of it. So not all hope is lost by a long shot !!
Of course it would have been nice if he just got well and all of this would be behind you. But really, when are things ever just easy, you know ??
The other stuff, well, "I" would want to know. At this point, with all the medical care and vet visits, why not test for other stuff, if nothing else, you can rule it out and stop worrying about it while you continue to treat his URI.
Just because he isn't 100 % yet doesn't mean he has some terrible disease. Since he is going back to the Vet, you could ask them to take the samples for the tests. Less stress on Yafe to keep being manhandled for meds, test, and whatnot.
I really wish you all best of luck with the little Dude. Him and you all deserve a break !!









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