Histopathological examination of spleen and head kidney from L. garvieae-infected and uninfected rainbow trout. A Spleen from uninfected trout. B Spleen from L. garvieae-infected trout. C Head kidney from uninfected trout. D Head kidney from L. garvieae-infected trout. White arrows, melanomacrophage groups in spleen and head kidney. Red arrows, granulomatous lesion of spleen. Green arrows, moderate tubular necrosis in head kidney. Horizontal bar, 100 µm.