Table 2.
Distribution of VGs in extended phylogenetic structure. The frequency of virulence genes among a particular E. coli phylogroup was compared to its prevalence in a group consisting of the isolates of all the other phylogenetic groups using the appropriate test for proportions.
| VG | Number (%) of E. coli Isolates with VGs within Phylogenetic Groups | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Piglets | Sows | |||||||||||||||
| A | B1 | B2 | C | D | E | F | NT | A | B1 | B2 | D | E | F | Clade I | NT | |
| n = 24 | n = 53 | n = 5 | n = 6 | n = 3 | n = 12 | n = 3 | n = 4 | n = 79 | n = 38 | n = 4 | n = 8 | n = 3 | n = 20 | n = 4 | n = 8 | |
| Adhesins | ||||||||||||||||
| fimH | 23 (95.8) | 51 (96.2) | 5 (100) | 6 (100) | 3 (100) | 12 (100) | 3 (100) | 4 (100) | 77 (97.5) | 38 (100) | 2 (50.0) | 5 (62.5) | 3 (100) | 5 (25.0) | 4 (100) | 8 (100) |
| papA | 0 | 9 (17.0) | 4 (80.0) | 0 | 0 | 0 | 0 | 0 | 0 | 4 (10.5) | 1 (25.0) | 1 (12.5) | 0 | 2 (10.0) | 0 | 0 |
| sfaS | 1 (4.2) | 0 | 1 (20.0) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Iron acquisition | ||||||||||||||||
| fyuA | 9 (37.5) | 8 (15.1) | 5 (100) | 6 (100) | 0 | 0 | 1 (33.3) | 0 | 11 (13.9) | 6 (15.8) | 2 (50.0) | 0 | 1 (33.3) | 0 | 0 | 3 (37.5) |
| iutA | 13 (54.2) | 23 (43.4) | 5 (100) | 6 (100) | 2 (66.7) | 4 (33.3) | 3 (100) | 0 | 8 (10.1) | 9 (23.7) | 4 (100) | 2 (25.0) | 0 | 7 (35.0) | 0 | 3 (37.5) |
| iroN | 9 (37.5) | 18 (34.0) | 5 (100) | 6 (100) | 1 (33.3) | 0 | 3 (100) | 1 (25.0) | 7 (8.9) | 13 (34.2) | 1 (25.0) | 0 | 0 | 5 (25.0) | 0 | 3 (37.5) |
| ireA | 3 (12.5) | 2 (3.8) | 1 (20.0) | 1 (16.7) | 0 | 0 | 0 | 0 | 2 (2.5) | 1 (2.6) | 0 | 0 | 0 | 1 | 0 | 1 (12.5) |
| Protectins | ||||||||||||||||
| kpsMTII | 2 (8.3) | 1 (1.9) | 4 (80.0) | 0 | 1 (33.3) | 1 (8.3) | 2 (66.7) | 1 (25.0) | 2 (2.5) | 3 (7.9) | 0 | 1 (12.5) | 0 | 1 (5.0) | 0 | 3 (37.5) |
| kpsMTIII | 0 | 1 (1.9) | 0 | 0 | 0 | 0 | 0 | 0 | 2 (2.5) | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| ompT | 6 (25.0) | 14 (26.4) | 5 (100) | 6 (100) | 2 (66.7) | 0 | 3 (100) | 0 | 7 (8.9) | 11 (28.9) | 0 | 0 | 0 | 7 (35.0) | 0 | 3 (37.5) |
| traT | 19 (79.2) | 49 (92.5) | 5 (100) | 5 (83.3) | 2 (66.7) | 9 (75.0) | 3 (100) | 2 (50.0) | 36 (45.6) | 25 (65.8) | 2 (50.0) | 5 (62.5) | 2 (66.7) | 13 (65.0) | 1 (25.0) | 6 (75.0) |
| iss | 6 (25.0) | 14 (26.4) | 5 (100) | 6 (100) | 1 (33.3) | 0 | 3 (100) | 0 | 7 (8.9) | 9 (23.7) | 0 | 0 | 0 | 6 (30.0) | 0 | 3 (37.5) |
| Toxins | ||||||||||||||||
| cnf1 | 0 | 1 (1.9) | 3 (60.0) | 1 (16.7) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| hlyA | 0 | 1 (1.9) | 1 (20.0) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Biofilm formation | ||||||||||||||||
| agn43 | 20 (83.3) | 19 (35.8) | 4 (80.0) | 5 (83.3) | 2 (66.7) | 5 (41.7) | 2 (66.7) | 2 (50.0) | 41 (51.9) | 19 (50.0) | 3 (75.0) | 3 (37.5) | 2 (66.7) | 10 (50.0) | 2 (50.0) | 7 (87.5) |
The values significantly higher than among the other groups are indicated in yellow. The values significantly lower than among the other groups are indicated in blue.