Figure 5.

Fluorescent visualization and localization of Vibrio in (A) the parasitic isopod Elthusa vulgaris. (B) Ventral dissection showing the enlarged digestive ceca. Scale bar 5 mm. (C) Excised digestive ceca and intestine. Scale bar, 4 mm. A-C were taken with a Pentax WG-III handheld camera. (D) intestine sectioned and Wright stained. Scale bar, 1 mm. Square indicates region in F. (E) ceca sectioned and Wright stained. Scale bar, 1 mm. (D,E) Imaged via light microscopy. (F) A Vibrio-specific fluorescent probe, shown in orange with Cy3, revealed a strong signal within a darkly stained area of the intestine, near the ceca junction. Scale bar 100 μm. (G) Vibrio cells, shown in orange, observed inside of cells, at a specific junction between the midgut and the anterior digestive ceca. Scale bar 20 μm. Isopod nuclei are shown in blue, via DAPI. int., intestine.