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Post-mortem material from the Wroclaw Zoo was obtained according to permits (No. PIW Wroc. UT-45\/5\/16 and No. PIW Wroc. UT- 45\/6\/16) issued by the District Veterinary Officer in Wroclaw (Poland). Post-mortem material from birds kept in private collections was obtained according to the permission (No. PU.555.15.2020) issued by the District Veterinary Officer in Wroclaw (Poland). Post-mortem material from birds found in the field was obtained according to the permission (No. WPN.6401.83.2021.MH) issued by the Regional Director for Environmental Protection in Wroclaw (Poland).","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Not applicable.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent to publish"}},{"value":"The authors declare no competing interests.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"213"}}