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Your absolute best option is a professional necropsy. If it's a virus, you need to know. It's not likely that this is anything you caused, but knowing exactly what it is makes a big difference in knowing how to deal with it going forward. Check the links we've given you, call the closest one...

I would send the next one for a necropsy with labs, you may be dealing with Marek's disease or something like lymphoid leukosis. https://www.metzerfarms.com/poultry-labs.html https://www.aphis.usda.gov/animal_health/nahln/downloads/all_nahln_lab_list.pdf