proliferative kidney disease ( pkd ) , caused by an unclassified protozoan ( pkx ) , is reported from pacific salmon , oncorhynchus tshawytscha ( walbaum ) and o. kisutch ( walbaum ) , and steelhead trout , salmo gairdneri richardson , held at the mad river hatchery in california , usa .
C0006754
california
C0041703
usa