Table 3 Prevalence of pathogenic subtypes and related virulence factors in Escherichia coli strains isolated from raw milk and traditional dairy product samples
| Samples (No. positive) | Subtypes | No. positive samples | Virulence genes |
|---|---|---|---|
| Raw bovine milk (30) | Non detected | 7 (43.75) | – |
| EHEC | 4 (25) | stx1, eae, ehly: 4 (100) | |
| AEEC | 5 (31.25) |
stx1: 5 (100) stx2: 3 (60) eaeA: 5 (100) stx1, eaeA: 3 (60) stx2, eaeA: 2 (40) stx1, stx2, eaeA: 1 (20) | |
| Total | 16 (53.33) | ||
| Raw ovine milk (21) | Non detected | 4 (44.44) | – |
| EHEC | 2 (22.22) | stx1, eae, ehly: 2 (100) | |
| AEEC | 3 (33.33) |
stx1: 3 (100) stx2: 1 (33.33) eaeA: 3 (100) stx1, eaeA: 1 (33.33) stx2, eaeA: 1 (33.33) stx1, stx2, eaeA: 1 (33.33) | |
| Total | 9 (42.85) | ||
| Raw caprine milk (23) | Non detected | 4 (36.36) | – |
| EHEC | 3 (27.27) | stx1, eae, ehly: 2 (100) | |
| AEEC | 4 (36.36) |
stx1: 4 (100) stx2: 2 (50) eaeA: 4 (100) stx1, eaeA: 2 (50) stx2, eaeA: 1 (25) stx1, stx2, eaeA: 1 (25) | |
| Total | 11 (47.82) | ||
| Raw buffalo milk (20) | Non detected | 4 (28.57) | – |
| EHEC | 5 (35.71) | stx1, eae, ehly: 5 (100) | |
| AEEC | 5 (35.71) |
stx1: 5 (100) stx2: 3 (60) eaeA: 5 (100) stx1, eaeA: 3 (60) stx2, eaeA: 1 (20) stx1, stx2, eaeA: 1 (20) | |
| Total | 14 (70) | ||
| Raw camel milk (2) | Non detected | 1 (100) | – |
| EHEC | – | – | |
| AEEC | – |
stx1: stx2: - eaeA: stx1, eaeA: stx2, eaeA: - stx1, stx2, eaeA: - | |
| Total | 1 (50) | ||
| Cheese (40) | Non detected | 8 (32) | – |
| EHEC | 8 (32) | stx1, eae, ehly: 8 (100) | |
| AEEC | 9 (36) |
stx1: 9 (100) stx2: 5 (55.55) eaeA: 8 (88.88) stx1, eaeA: 5 (66.66) stx2, eaeA: 2 (22.22) stx1, stx2, eaeA: 2 (22.22) | |
| Total | 25 (62.50) | ||
| Yoghurt (5) | Non detected | 1 (33.33) | – |
| EHEC | 1 (33.33) | stx1, eae, ehly: 1 (100) | |
| AEEC | 1 (33.33) |
stx1: 1 (100) stx2: 1 (100) eaeA: 1 (100) stx1, eaeA: 1 (100) stx2, eaeA: 1 (100) stx1, stx2, eaeA: 1 (100) | |
| Total | 3 (60) | ||
| Butter (10) | Non detected | 2 (33.33) | – |
| EHEC | 1 (16.66) | stx1, eae, ehly: 1 (100) | |
| AEEC | 3 (50) |
stx1: 3 (100) stx2: 1 (33.33) eaeA: 3 (100) stx1, eaeA: 1 (33.33) stx2, eaeA: 1 (33.33) stx1, stx2, eaeA: 1 (33.33) | |
| Total | 6 (60) | ||
| Cream (15) | Non detected | 2 (25) | – |
| EHEC | 2 (25) | stx1, eae, ehly: 2 (100) | |
| AEEC | 4 (50) |
stx1: 4 (100) stx2: 2 (50) eaeA: 3 (75) stx1, eaeA: 2 (50) stx2, eaeA: 1 (25) stx1, stx2, eaeA: 1 (25) | |
| Total | 8 (53.33) | ||
| Ice-cream (15) | Non detected | 2 (22.22) | – |
| EHEC | 2 (22.22) | stx1, eae, ehly: 2 (100) | |
| AEEC | 5 (55.55) |
stx1: 5 (100) stx2: 3 (60) eaeA: 5 (100) stx1, eaeA: 2 (40) stx2, eaeA: 2 (40) stx1, stx2, eaeA: 1 (20) | |
| Total | 9 (60) | ||