A wild adult Greater Sage-grouse (Centrocercus urophasianus) from northeastern Oregon, US, was found dead, with multiorgan necrosis and inflammation associated with protozoal schizonts and phanerozoites. Molecular characterization identified these protozoa as Plasmodium homopolare H2 and a novel Leucocytozoon sp. lineage. Fatal systemic haemosporidiosis has not been previously reported in Greater Sage-grouse.

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