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Avian trichomonosis is a common and widespread disease, traditionally affecting columbids and raptors, and recently emerging among finch populations mainly in Europe. Across Europe, finch trichomonosis is caused by a single clonal strain of  Trichomonas gallinae  and negatively impacts finch populations. Here, we report an outbreak of finch trichomonosis in the wintering populations of  Chloris chloris  (European greenfinch) and  Carduelis carduelis  (European goldfinch) from the Boulonnais, in northern France. The outbreak was detected and monitored by bird ringers during their wintering bird ringing protocols. A total of 105 records from 12 sites were collected during the first quarter of 2017, with 46 and 59 concerning dead and diseased birds, respectively. Fourteen carcasses from two locations were necropsied and screened for multiple pathogens; the only causative agent identified was  T. gallinae . Genetic characterization was performed by four markers (small subunit ribosomal RNA, hydrogenosomal iron-hydrogenase, and RNA polymerase II subunit 1 genes, and the internal transcribed spacers (ITS) region) and confirmed the  T. gallinae  strain to be A1, which affects the finch populations of Europe. This was also confirmed by an ITS-based phylogenetic analysis which further illustrated the diversity of the  Trichomonas  infecting birds. Preliminary data on the survival and dispersion of infected birds were obtained from ring-returns of diseased individuals. The anthropogenic spread of diseases through bird feeding practices is highlighted and some suggestions to prevent pathogen transmission via backyard supplementary feeders for garden birds are given.

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An outbreak of trichomonosis in European greenfinches<i>Chloris chloris</i>and European goldfinches<i>Carduelis carduelis</i>wintering in Northern France

An outbreak of trichomonosis in European greenfinchesChloris chlorisand European goldfinchesCarduelis cardueliswintering in Northern France