RESULTS
Clinical and Post Mortem Findings: The clinical examination of diseased fish exhibited: loss of equilibrium, ascitis, skin darkness, exophthalmia and ulcers varied in their degrees. Congestion and enlargement in internal organs were appeared in postmortem examination (Figure 1).
Bacteriological Isolation and Identification: A total of 10 A. hydrophila strains were completely identified with an incidence of isolation 25% by culturing on R-S and MacConky agar media. The strains gave smooth, yellow and non- lactose fermenter colonies on the previous media. All strains were Gram negative, motile rods. Traditional biochemical identification showed the same results as obtained by the API 20 E system.
Results of PCR for the Detection of Aerolysin Gene: A total of 2 A. hydrophila strains out of the tested 10 isolates carried aerolysin gene at the expected product size (309 bp) as showed in photo (1).
Histopathological Findings
Gills: Gills showed hyperplasia and fusion of gill lamellae (Fig. 2a), dilatation with congestion of central venous sinus (Fig. 2b), lamellar telangiectasia (Fig. 2c) and branchitis characterized by congestion of the branchial blood vessels with intense leukocytic infiltration (Fig. 2d).
Liver and Kidney: Liver showed marked dilatation with congestion of hepatoportal blood vessel and sinusoids with diffuse vacuolar degeneration of hepatocytes (Fig. 3a), liver hemorrhage (Fig. 3b) and liver cell necrosis with pyknotic nuclei associated with loss of structural integrity.
Kidney showed congestion of interstitial blood vessels and renal glomerular tuft (Fig. 3d), focal interstitial hemorrhage with necrobiotic changes of the surrounding renal tubular epithelium characterized by karryopyknosis and chromatolysis (Fig. 3e) and focal interstitial infiltration of mononuclear cells with vacuolar and hyaline droplet degeneration of the surrounding renal tubular epithelium.
Spleen: Spleen showed subcapsular necrosis (Fig. 4a) and splenic hemorrhage with aggregation of hemosiderin- laden macrophages.
Intestine: Intestine showed necrosis of intestinal mucosa especially the apical portion of intestinal villi (Fig. 5a) with marked congestion of the sub mucosal blood vessels associated with edema and inflammatory cell infiltration (Fig. 5b). The inflammatory cellular infiltrates consisted mainly of mononuclear cells and eosinophilic granular cells (EGCs) (Fig. 5c) that were degranulated (Fig. 5d). The lumens of intestinal glands were filled with necrotic materials.
RESULTSClinical and Post Mortem Findings: The clinical examination of diseased fish exhibited: loss of equilibrium, ascitis, skin darkness, exophthalmia and ulcers varied in their degrees. Congestion and enlargement in internal organs were appeared in postmortem examination (Figure 1).Bacteriological Isolation and Identification: A total of 10 A. hydrophila strains were completely identified with an incidence of isolation 25% by culturing on R-S and MacConky agar media. The strains gave smooth, yellow and non- lactose fermenter colonies on the previous media. All strains were Gram negative, motile rods. Traditional biochemical identification showed the same results as obtained by the API 20 E system.Results of PCR for the Detection of Aerolysin Gene: A total of 2 A. hydrophila strains out of the tested 10 isolates carried aerolysin gene at the expected product size (309 bp) as showed in photo (1).Histopathological Findings Gills: Gills showed hyperplasia and fusion of gill lamellae (Fig. 2a), dilatation with congestion of central venous sinus (Fig. 2b), lamellar telangiectasia (Fig. 2c) and branchitis characterized by congestion of the branchial blood vessels with intense leukocytic infiltration (Fig. 2d). Liver and Kidney: Liver showed marked dilatation with congestion of hepatoportal blood vessel and sinusoids with diffuse vacuolar degeneration of hepatocytes (Fig. 3a), liver hemorrhage (Fig. 3b) and liver cell necrosis with pyknotic nuclei associated with loss of structural integrity. Kidney showed congestion of interstitial blood vessels and renal glomerular tuft (Fig. 3d), focal interstitial hemorrhage with necrobiotic changes of the surrounding renal tubular epithelium characterized by karryopyknosis and chromatolysis (Fig. 3e) and focal interstitial infiltration of mononuclear cells with vacuolar and hyaline droplet degeneration of the surrounding renal tubular epithelium. Spleen: Spleen showed subcapsular necrosis (Fig. 4a) and splenic hemorrhage with aggregation of hemosiderin- laden macrophages. Intestine: Intestine showed necrosis of intestinal mucosa especially the apical portion of intestinal villi (Fig. 5a) with marked congestion of the sub mucosal blood vessels associated with edema and inflammatory cell infiltration (Fig. 5b). The inflammatory cellular infiltrates consisted mainly of mononuclear cells and eosinophilic granular cells (EGCs) (Fig. 5c) that were degranulated (Fig. 5d). The lumens of intestinal glands were filled with necrotic materials.
การแปล กรุณารอสักครู่..
