Characterization of bacteriophage j2 of Salmonella typhi as a generalized transducing phage closely related to coliphage P1.

Phage j2, a lysogenic phage in Salmonella typhi J2, was shown to produce tiny plaques on various Vi type strains of S. typhi, to be a generalized transducing phage, and to have many characteristics including a serological one in common with phage P1 of Escherichia coli. Lysogenization of various S. typhi type strains with j2 or P1-group phages usually resulted in the alteration of the phage types of the S. typhi strains, except that phage j2 did not cause alteration of type 53. Phage j2 transduced, at high frequencies, much larger DNA molecules (up to at least 70 megadaltons) than those known to be transduced by Salmonella phage P22: this should prove useful for the genetic analysis of S. typhi.