FIG 2.

Quantification of Stx1 and Stx2 phage particles. Quantification by enumeration of lysis plaques from particles of Stx1 and Stx2 phages obtained from supernatants derived from MMC-treated STEC O26:H11 cultures was performed. The STEC strains were from dairy (D) and human (H) origins, and their Stx phages were integrated into wrbA, yehV, yecE, or sbcB sites. The titer of the original phage preparation was expressed in PFU per milliliter (PFU/ml). The data were obtained from three independent analyses, and the average titers for each phage are shown. Bars indicate standard deviations.