Table 4.
Results from PCR-MS analysis of spiked foodsa
| Food | Spike (CFU/25 g) | S. enterica serovar | PCR-MS resultsb |
|---|---|---|---|
| Chili powder | 3 | Weltevreden | |
| 3 | Weltevreden | LQ | |
| 3 | Weltevreden | LQ | |
| 3 | Weltevreden | LQ | |
| 3 | Weltevreden | LQ | |
| 3 | Weltevreden | LQ | |
| 30 | Weltevreden | LQ | |
| 30 | Weltevreden | LQ | |
| 30 | Weltevreden | Weltevreden (+8) | |
| 30 | Weltevreden | Weltevreden (+8) | |
| 30 | Weltevreden | Weltevreden (+2) | |
| 30 | Weltevreden | Weltevreden (+2) | |
| Tomato | 2.4 | Newport | |
| 2.4 | Newport | ||
| 2.4 | Newport | ||
| 2.4 | Newport | LQ | |
| 2.4 | Newport | Mgulani (+1) | |
| 2.4 | Newport | Newport (+7) | |
| 24 | Newport | ||
| 24 | Newport | ||
| 24 | Newport | Telaviv (+2) | |
| 24 | Newport | Newport (+1) | |
| 24 | Newport | Newport | |
| 24 | Newport | Newport | |
| Soft cheese | 3.8 | Typhimurium | Typhimurium (+1) |
| 3.8 | Typhimurium | Typhimurium (+1) | |
| 3.8 | Typhimurium | Typhimurium (+1) | |
| 3.8 | Typhimurium | Typhimurium (+1) | |
| 3.8 | Typhimurium | Typhimurium (+1) | |
| 3.8 | Typhimurium | Typhimurium (+1) | |
| 38 | Typhimurium | Typhimurium (+1) | |
| 38 | Typhimurium | Typhimurium (+1) | |
| 38 | Typhimurium | Typhimurium (+1) | |
| 38 | Typhimurium | Typhimurium (+1) | |
| 38 | Typhimurium | Typhimurium (+1) | |
| 38 | Typhimurium | Typhimurium (+1) | |
| Fish | 2 | Senftenberg | LQ |
| 2 | Senftenberg | LQ | |
| 2 | Senftenberg | Butantan | |
| 2 | Senftenberg | Senftenberg (+22) | |
| 2 | Senftenberg | Senftenberg (+16) | |
| 2 | Senftenberg | Senftenberg (+15) | |
| 20 | Senftenberg | Senftenberg (+16) | |
| 20 | Senftenberg | Senftenberg (+16) | |
| 20 | Senftenberg | Senftenberg (+15) | |
| 20 | Senftenberg | Senftenberg (+15) | |
| 20 | Senftenberg | Senftenberg (+15) | |
| 20 | Senftenberg | Senftenberg (+15) |
a
Only the preenrichment broth (mBPW) was tested for each sample. Results from unspiked samples are not shown.
b
Values in parentheses indicate the number of other serovars listed at the same confidence level. LQ, low-quality match to S. enterica (match in 1 of 6 wells).