TABLE 1.
D values of various E. coli strainsb
| Heat treatment |
D value (min) for straina: |
|||
|---|---|---|---|---|
| HEC | HEC-RM | NPEC | HEC-VM | |
| Control | 5.1 E | 4.1 D | 3.1 C | 2.6 D |
| 42°C HS | 8.3 B | 6.5 A | 4.1 A | 3.9 B |
| 45°C HS | 7.8 C | 5.5 B | 3.9 AB | 3.7 B |
| 42°C HA | 9.0 A | 4.8 C | 4.0 A | 5.8 A |
| 45°C HA | 6.2 D | 4.4 CD | 3.6 C | 3.0 C |
a
Values in the same column followed by different letters are significantly different (P < 0.05; n = 6).
b
E. coli 0157:H7 (HEC), E. coli O157:H7 rpoS mutant (HEC-RM), NPEC, and E. coli O157:H7 verotoxin mutant (HEC-VM) heated in tryptic soy broth at 57°C.