At the end of the summer of 2016, unusually high levels of mortality were detected in Passeriformes and Strigiformes in Flanders, Belgium, mainly in Eurasian Blackbirds ( Turdus merula). A passive surveillance program demonstrated a widespread Usutu virus outbreak and revealed a coinfection with Plasmodium in 99% of the dead passerine birds that were necropsied.
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