Histological structure of kidney showing normal renal glomeruli and tubules (arrowhead and arrow, respectively) at 9th and 23rd dpi., in non-infected non treated chicken (G1), features of interstitial nephritis (arrow indicates mononuclear infiltration) at 9th dpi. and features of regenerative tubular basophilia (arrow) at 23rd dpi., in infected non treated chicken (G2), foci of interstitial nephritis (arrow indicates mononuclear infiltration) at 9th dpi. and mild degenerative changes within the renal tubular epithelium (arrow) (arrowhead indicates normal glomerulus) at 23rd dpi., in infected chicken treated with cashew oil (G3), mild degenerative and desquamative changes within the renal tubules (arrow) at 9th dpi. and normal renal glomeruli (arrowhead) and tubules (arrow) at 23rd dpi., in infected chicken treated with toltrazuril (G4), mild cloudy swelling of the renal tubules (arrow) (arrowhead indicates normal glomerulus) at 9th dpi. and normal renal glomeruli (arrowhead) and tubules (arrow) at 23rd dpi., in infected chicken treated with cashew oil+toltrazuril (G5). H & E, X200.