Figure 4From: The microsporidian Enterocytozoon hepatopenaei is not the cause of white feces syndrome in whiteleg shrimp Penaeus (Litopenaeus) vannameiPhotomicrographs of infected hepatopancreatic tissue of P. vannamei. The adjacent sections of shrimp tissue stained with H&E (column 1) and with the in situ hybridization probe (column 2) showing that hepatopancreatic cells of P. vannamei infected with the microsporidian cannot be easily detected by H&E staining even though extensive infection is revealed by in situ hybridization (dark brown to black staining). (a/b) Low magnification showing that positive reactions are restricted to the medial and proximal tubule epithelial cells of the shrimp hepatopancreas (HP) while the distal E cells are negative. Note that B cells dominate in the infected region. (c/d) Medium high magnification showing pinpoint positive, in situ hybridization reactions in the region of the HP adjacent to the distal E cells region. (e/f) High magnification clearly showing the difficulty in identifying infected cells by H&E staining but their clear revelation by in situ hybridization. (g/h) Very high magnification, emphasizing the features described in (e/f).Back to article page