FIG. 3.

E. coli O157:H7 lysis by a mixture of phages. Cultures were incubated at 37°C (A) or 4°C (B). E. coli O157:H7 (3 × 10⁴ CFU) was infected with a mixed phage suspension (10⁷ PFU) containing equal concentrations of KH1, KH4, and KH5. Cultures were incubated with (▵) or without (▴) aeration. The controls contained only E. coli O157:H7 and were either aerated (○) or not aerated (●). The standard errors of the E. coli O157:H7 concentrations ranged from 0 to 0.5 log₁₀ CFU/ml (n = 4).