TABLE 3.
Recovery of heat-injured E. coli O157:H7 and S. typhimurium from inoculated beef trim with TSA, selective media, and the agar underlay method with selective mediaa
| Time | Log CFU/g
|
|||
|---|---|---|---|---|
|
E. coli O157:H7
|
S. typhimurium
|
|||
| SMAC, direct | SMAC, agar underlay | XLD, direct | XLD, agar underlay | |
| Before heat treatment | 4.23 ± 0.26a | 4.48 ± 0.39a | 4.41 ± 0.43a | 4.57 ± 0.25a |
| After heat treatment | 2.66 ± 0.36b | 3.64 ± 0.16c | 2.59 ± 0.52b | 3.41 ± 0.28c |
a
Data represent means ± standard deviations of three measurements before or after treatment (80°C for 30 s). Values followed by different letters are statistically different (P < 0.05).