To investigate the possible cytotoxic effects of EB211 and EB279, female C57BL/6 mice (groups of six, seven to eight-week-old), obtained from the Animal Laboratory of the Pasteur Institute of Iran, were injected intraperitoneally twice daily with EB211 (12 mg/kg), EB279 (12 mg/kg), or a cocktail of the two scFvs (6 mg/kg of each) for 72 h. Mice injected intraperitoneally twice daily with 30 mg/kg of CMS (Colistin is administered as the prodrug colistimethate sodium [CMS] [55–58]; Sigma-Aldrich, Saint Louis, USA) or NS for 72 h were used as the controls. All mice were sacrificed by intraperitoneal injection of an overdose (5 times the anesthetic dose; [59]) of ketamine and xylazine (Alfasan, Woerden, The Netherlands) at 72 h of infection. The kidneys and liver were aseptically removed and then fixed in 10% formalin for 24 h, followed by embedding in paraffin. Then, thin sections of tissues stained with hematoxylin-eosin were microscopically analyzed for histopathological changes.
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