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Although these pathogens may cause morbidity or mortality, the vectors and patterns of transmission remain unknown for the great majority of avian haemoproteids. <jats:italic>Haemoproteus nucleocondensus<\/jats:italic> has been frequently reported in Europe in great reed warblers <jats:italic>Acrocephalus arundinaceus<\/jats:italic> after their arrival from African wintering grounds, but this infection has not been found in juveniles at the breeding sites. The factors that prevent its transmission remain unclear. This study was designed to test whether the sporogony of <jats:italic>H. nucleocondensus<\/jats:italic> (lineage hGRW8) can be completed in <jats:italic>Culicoides impunctatus<\/jats:italic>, one of the most abundant European biting midge species. Wild-caught females were infected with <jats:italic>H. nucleocondensus<\/jats:italic> from great reed warblers. Microscopic examination and PCR-based methods were used to detect sporogonic stages and to confirm species identity. This study showed that <jats:italic>H. nucleocondensus<\/jats:italic> completes sporogony in <jats:italic>C. impunctatus<\/jats:italic>, suggesting that there are no obstacles to its transmission from the point of view of vector availability and average temperature in Northern Europe. We discuss other ecological factors which should be considered to explain why the transmission of <jats:italic>H. nucleocondensus<\/jats:italic> and some other Southern origin haemosporidians are interrupted in North Europe.<\/jats:p>","DOI":"10.1017\/s0031182020000116","type":"journal-article","created":{"date-parts":[[2020,1,29]],"date-time":"2020-01-29T07:20:16Z","timestamp":1580282416000},"page":"593-600","update-policy":"https:\/\/doi.org\/10.1017\/policypage","source":"Crossref","is-referenced-by-count":6,"title":["Complete sporogony of the blood parasite <i>Haemoproteus nucleocondensus<\/i> in common biting midges: why is its transmission interrupted in 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