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Background. Colicin produce by colicinogenic E. coli (CEC) arenarrow limited spectrum antimicrobial agents that are able to kill or prevent close related strains. Objective. The objective of this study was to evaluation effect of Colicin to induce immunized mice to prevent infection caused by E. coliK99. Patient and Methods. The experiment was conducted into two mice groups (30 in each group) with two weeks old. All mice were administered by streptomycin sulfate prior to treatment to eliminate resident E. coli. Group one was orally inoculated with PBS as control and the second was immunized by Colicin solution as immunize group. Both control and immunized group were challenged by 3 LD 50 of E. coli K99 and follow a week. Results. Immunized mice group were not showed severe clinical signs. While diarrhea with different sings of colibaccillosis was established in control group and infected mice was died. Conclusion. Overuse antibiotics developed serious new types of multi drug resistance in human medicine and therefore has limited their use in farm animals. The study indicates the use of Colicin and biotherapy instead of antibiotic is more safe and efficient for control of E. coliK99 infection. Immunized mice by Colicin solution protected E. coli K99 colonization and reduce fecal shedding. Investigation in livestock for applying Colicin in farm animal is recommended.

Evaluation of Colicin Effect on the Induction of Treated Mice in Prevention of Infection Caused by Escherichia coli K99