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Sorry. Didn’t notice you were in Canada. Start with university departments and also any labs that local vets use. You will probably spend some time finding someone but I am sure they are out there! From what you described there will be plenty of new scrapings to send once you find a lab...

I think you should try and get the scrapings off the skin examined by a pathologist. Your local state lab would likely be able to help. It could be fungal with secondary bacterial infection for example. They can test the gunk for Marek’s at the same time.