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Decrease of the P. lactis population in the milk due to phage HU1 infection. Viable cell numbers for the P. lactis YT4 strain were monitored with the phage HU1 infection (closed circles) or without the phage infection (open circles) in CM-LB broth (a), skim milk (b), and whole milk (c). For closed-circle data, phages were added at time zero. Data are expressed as average values of CFU on 2 to 6 agar plates.
