Micro December 2018

1

Dry Dog Food

0 0.5 1 1.5 2 2.5 3 3.5 4

yISO = 0.9728x + 0.0414

R² = 0.979

3M Petrifilm REC ISO

yREC = 0.9933x + 0.0227

LOG 10 REP A CFU/g

R² = 0.973

0

0.5

1

1.5

2

2.5

3

3.5

4

LOG 10

REP B CFU/g

2 Figure 5: Youden’s Plot for 3M Petrifilm Rapid E. coli /Coliform Count Plate (42 o C) and ISO 3 16649-2 for E. coli

4 5

21