HE staining of mouse gut. HE stained of mouse duodenum and colon tissues at 8h of STEC + phage cocktail group (A), PBS + phage cocktail group (B), STEC + enrofloxacin group (C), PBS + enrofloxacin group (D), PBS + PBS group (E) and STEC + PBS group (F). And HE stained of mouse duodenum and colon tissues at 17d of STEC + phage cocktail group (G), PBS + phage cocktail group (H), STEC + enrofloxacin group (I), PBS + enrofloxacin group (J), PBS + PBS group (K). The magnification of mouse duodenum and colon tissues is ×100.