Figure 7
Immunohistochemical detection of E. coli in the caecal samples of turkeys. A Negative control, absence of immunostaining for E. coli; B presence of E. coli in the caecal content (arrow heads) of a sample from the severe lesion group that was infected with H. meleagridis; C–E profound presence of E. coli (arrow heads) in the caecal content without any infiltration into the caecal wall, caeca are severely inflamed and necrotized after experimental infection with monoxenic H. meleagridis culture (C), xenic H. meleagridis culture (D) natural infection from a field case E.