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I don't have ducks but have friends that raise them. Hopefully the vet will have an answer. Have you posted to the Ducks, or the Emergencies / Diseases / Injuries and Cures forums yet. Good luck...
Hello and welcome to BYC, You found an Amazing Poultry Community to be a part of with many great knowledgeable members, who are more then willing to jump in and help you along your journey with any questions you may have.
Good luck with your duck, @Isaac 0 may be able to help.