Conclusion
Among the six bacteriophages isolated and characterized in this study, JH1 was related to JH2, and JH3 was related to JH4, based on the spectrum of activity against O8:F18 ETEC, morphology and restriction enzyme digestion patterns. These bacteriophages all exhibited high activity against O8:F18 ETEC and genomic analyses will provide further indication of the extent of their relationships. The information gained from the present study provides a basis for selection of bacteriophages for their potential therapeutic and prophylactic use against O8:F18 ETEC infections in piglets.