Table 1. Abundance of genotype/phenotype factors by source (Bovine, Ovine, Food/Environment and Clinical) for the Scottish E. coli O157 isolates.
| Factor | Sub-type | No. (%) of strains with factora |
||||
|---|---|---|---|---|---|---|
| Bovine(n = 26) | Ovine(n = 25) | Food/Env.(n = 20) | Clinical(n = 74) | Statistically significantpairwise comparisonsb | ||
| O encoding antigen | rfbO157 | 26 (100.0) | 25 (100.0) | 20 (100.0) | 74 (100.0) | NA |
| Intimin | eae | 26 (100.0) | 25 (100.0) | 20 (100.0) | 74 (100.0) | NA |
| Enterohemolysin | hlyA | 26 (100.0) | 25 (100.0) | 20 (100.0) | 74 (100.0) | NA |
| Shiga toxin | stx1a/stx2a | 0 (0.0) | 0 (0.0) | 1 (5.0) | 3 (4.1) | none |
| stx1a/stx2c | 6 (23.1) | 4 (16.0) | 0 (0.0) | 12 (16.2) | BF | |
| stx2a | 0 (0.0) | 0 (0.0) | 3 (15.0) | 5 (6.8) | none | |
| stx2a/stx2c | 18 (69.2) | 14 (56.0) | 13 (65.0) | 45 (60.8) | none | |
| stx2c | 2 (7.7) | 6 (24.0) | 0 (0.0) | 5 (6.8) | CO, FO | |
| −ve | 0 (0.0) | 1 (4.0) | 3 (15.0) | 4 (5.4) | none | |
| Phage Type | PT2 | 1 (3.8) | 1 (4.3) | 2 (22.2) | 3 (5.8) | none |
| PT21/28 | 16 (61.5) | 11 (47.8) | 4 (44.4) | 27 (51.9) | none | |
| PT32 | 2 (7.7) | 3 (13.0) | 2 (22.2) | 8 (15.4) | none | |
| PT8 | 5 (19.2) | 4 (17.4) | 0 (0.0) | 5 (9.6) | none | |
| Otherc | 2 (7.7) | 4 (17.4) | 1 (11.1) | 9 (17.3) | none | |
| SBI | Sub-type | |||||
| ASY2a2c | 9 (34.6) | 11 (44.0) | 4 (20.0) | 27 (36.5) | none | |
| SY1a2c | 5 (19.2) | 2 (8.0) | 0 (0.0) | 12 (16.2) | none | |
| SY2a2c | 8 (30.8) | 2 (8.0) | 9 (45.0) | 14 (8.9) | CF, CO, FO | |
| SY2c | 1 (3.8) | 2 (8.0) | 0 (0.0) | 3 (4.1) | CF, FO | |
| YN | 0 (0.0) | 1 (4.0) | 1 (5.0) | 3 (4.1) | none | |
| Otherd | 3 (11.5) | 7 (28.0) | 6 (30.0) | 15 (20.3) | none | |
aNo of strains phage typed: bovine (n = 26), ovine (n = 23), food/env (n = 9) and clinical (n = 52).
bListed are statistically different pairwise comparisons where B = bovine, O = ovine, F = Food/Environmental and C = clinical. Statistical significance determined by Fisher’s exact test.
cOther defines all Phage Types present in <5 Isolates.
dOther defines all SBI genotypes present in <5 isolates.