TABLE 1.
Comparison of enrichment methods with GN broth or TSB to detect E. coli O157 in inoculated cattle feeds
| Expt | Enrichment procedure | Total no. of samples | No. of positive samples | Sensitivitya (%) |
|---|---|---|---|---|
| 1 | GN broth with no antibiotics added | 30 | 21 | 70.0* |
| GNccvb | 30 | 26 | 86.7* | |
| GN/GNccvb | 30 | 24 | 80.0* | |
| 2 | GN broth with no antibiotics added | 40 | 10 | 25.0* |
| TSB with no antibiotics added | 40 | 20 | 50.0† | |
| 3 | TSB with no antibiotics added | 45 | 16 | 35.6* |
| TSBcvc | 5 | 20 | 44.4*† | |
| TSB/TSBcvc | 45 | 24 | 53.3† |
a
Sensitivity values within each experiment with different symbols are significantly different (P ≤ 0.05).
b
Cefixime, cefsulodin, and vancomycin were included in the medium at 0.05, 10.0, and 8.0 mg/liter, respectively.
c
Cefixime and vancomycin were included in the medium at 0.05 and 8.0 mg/liter, respectively.