Pathology of a Gammabaculovirus in Its Natural Balsam Fir Sawfly (Neodiprion abietis) Host

Figure 25

Cross-section of midgut epithelium at 120 hpi. The enlarged nucleus of the cell, to the left of center, is full of occlusion bodies (OB). The basal end of this cell lies proximal to circular muscle but the cytoplasm in this region of the cell appears vacuolated (between arrowheads). Bacteria (arrows) are present in the hemocoel adjacent to longitudinal muscles (LM). An epithelial cell has detached (DC) from the midgut epithelium and is free within the gut lumen near the microvilli (MV) of the surrounding, still attached, midgut cells. Epoxy section, photomicrograph. Scale bar = 20 μm.