Figure 1
Photographs from healthy P. vannamei shrimp and shrimp infected with BA55 strain carrying PirVP genes associated with AHPND. (A) Left shrimp view. Gross signs of AHPND-infected shrimp (left): pale, atrophied hepatopancreas surrounded with a white membrane with smooth consistency (black arrow). Normal shrimp (right): normal size hepatopancreas with brownish color. (B) Right shrimp view. Gross signs of AHPND-infected shrimp (left): complete hepatopancreas destruction (black arrow). Normal shrimp (right): normal size hepatopancreas with brownish color. (C) Hematoxylin and eosin-stained histological sections of the hepatopancreas of P. vannamei from sick shrimps. AHPND pathology characterized by sloughing of hepatopancreatic tubule epithelial cells (black arrow). (D) Hematoxylin and eosin-stained histological sections of the normal shrimp hepatopancreas. (E) Histological sections show severe necrosis of the hepatopancreas tubules (black arrow), making it impossible to discriminate the different types of cells. (F) Histological sections show cellular detachment caused by a bacterial infection, evidencing the formation of melanized haemocytic nodules (black arrow).
