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Characterization of phage SP15. (A) Host range of SP15 phage against various Escherichia coli strains. Bacterial strains in red and black letters indicate O157 and non-O157 strains, respectively. The previously isolated phage PP01 was used for comparison. (B) Morphological observation of SP15 under TEM. (C) One-step growth of SP15. (D) Phylogenetic tree of PP01 and SP15 among T-series and lambda phages.
