Figure 5. Transmission electron microscopy of the jejunum of one-day-old SPF chickens infected with the Shigella strain ZD02 via ligated intestinal loop.

Shigella (arrowheads) were found near the epithelial cells at 2 h post-inoculation (A. Scale bar = 1 µm). Internalized bacteria (arrowheads) in the epithelial cells were found at 6 h (B. Scale bar = 5 µm) and 8 h (C. Scale bar = 5 µm). The epithelial cells started to lyse and release bacteria (arrowheads) at 12 h (D. Scale bar = 5 µm).