TABLE 1.

Phage susceptibility and c74.22 reactivity of strains investigated in this study

Strainc74.22 reactivityaPhage susceptibilityb
Φ20422-1A500A511
4b1+SSS
M44RRR
M44::pPL2RRR
M44::pPL95+SSS
  • a Determined as described in the legend to Fig. 1.

  • b S and R indicate susceptibility and resistance, respectively, determined on the basis of plaque formation following infection of the bacteria (ca. 1 × 108 CFU/ml) with the phage (ca. 1 × 106 PFU/ml), done as described previously (14). The phage infection assays for each phage were done in duplicate and in at least two independent experiments.