Table 2.

Decimal reductiona of the numbers of different microbial parameters after 168 h in the in situ inactivation experiments

Experiment no.Decimal reduction of the no. of:
E. colib CFUE. coli O157:H7c CFUSomatic coliphages (PFU)Phages infecting O157:H7 (PFU)Phages infecting O157:H7 and carrying the Stx2 gene (MPN)
1>2.52.91.61.7>1
2>2.52.40.91.2>1
3>3.0>3.02.62.41.9
42.22.71.81.41.6
51.92.51.81.41.1
62.32.11.71.30.5
  • a Decimal reduction calculated as the decrease in log units.

  • b Naturally occurring E. coli.

  • c Seeded E. coli O157:H7.